Use a (mostly) hermetic Python interpreter

It still requires python to be installed on the host to run the wrapper
scripts, but it's close to being fully hermetic.

This also requires/enables the following changes, unfortunately all at
the same time:
 * Use a downloaded f2py
 * Use a downloaded scipy/numpy/matplotlib
 * Fix a few things that don't run with the python version in their #!
 * Stop using bazel-generated __init__.py files, because those interfere
   with importing matplotlib nicely

Change-Id: Ife280464613d67cece9587b7d947f0b1d5466d7e
diff --git a/y2016/control_loops/BUILD b/y2016/control_loops/BUILD
new file mode 100644
index 0000000..de3bfeb
--- /dev/null
+++ b/y2016/control_loops/BUILD
@@ -0,0 +1,6 @@
+py_library(
+    name = "python_init",
+    srcs = ["__init__.py"],
+    visibility = ["//visibility:public"],
+    deps = ["//y2016:python_init"],
+)
diff --git a/y2016/control_loops/__init__.py b/y2016/control_loops/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/y2016/control_loops/__init__.py
diff --git a/y2016/control_loops/python/BUILD b/y2016/control_loops/python/BUILD
index d2a5905..adb3150 100644
--- a/y2016/control_loops/python/BUILD
+++ b/y2016/control_loops/python/BUILD
@@ -1,156 +1,184 @@
-package(default_visibility = ['//y2016:__subpackages__'])
+package(default_visibility = ["//y2016:__subpackages__"])
 
 py_binary(
-  name = 'drivetrain',
-  srcs = [
-    'drivetrain.py',
-  ],
-  deps = [
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:drivetrain',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "drivetrain",
+    srcs = [
+        "drivetrain.py",
+    ],
+    legacy_create_init = False,
+    restricted_to = ["//tools:k8"],
+    deps = [
+        ":python_init",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:drivetrain",
+    ],
 )
 
 py_binary(
-  name = 'polydrivetrain',
-  srcs = [
-    'polydrivetrain.py',
-    'drivetrain.py',
-  ],
-  deps = [
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:polydrivetrain',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "polydrivetrain",
+    srcs = [
+        "drivetrain.py",
+        "polydrivetrain.py",
+    ],
+    legacy_create_init = False,
+    restricted_to = ["//tools:k8"],
+    deps = [
+        ":python_init",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:polydrivetrain",
+    ],
 )
 
 py_library(
-  name = 'polydrivetrain_lib',
-  srcs = [
-    'polydrivetrain.py',
-    'drivetrain.py',
-  ],
-  deps = [
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "polydrivetrain_lib",
+    srcs = [
+        "drivetrain.py",
+        "polydrivetrain.py",
+    ],
+    restricted_to = ["//tools:k8"],
+    deps = [
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+    ],
 )
 
 py_binary(
-  name = 'shooter',
-  srcs = [
-    'shooter.py',
-  ],
-  deps = [
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "shooter",
+    srcs = [
+        "shooter.py",
+    ],
+    legacy_create_init = False,
+    restricted_to = ["//tools:k8"],
+    deps = [
+        ":python_init",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+        "@matplotlib",
+    ],
 )
 
 py_binary(
-  name = 'intake',
-  srcs = [
-    'intake.py',
-  ],
-  deps = [
-    '//aos/common/util:py_trapezoid_profile',
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "intake",
+    srcs = [
+        "intake.py",
+    ],
+    legacy_create_init = False,
+    restricted_to = ["//tools:k8"],
+    deps = [
+        ":python_init",
+        "//aos/common/util:py_trapezoid_profile",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+        "@matplotlib",
+    ],
 )
 
 py_binary(
-  name = 'shoulder',
-  srcs = [
-    'shoulder.py',
-  ],
-  deps = [
-    '//aos/common/util:py_trapezoid_profile',
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "shoulder",
+    srcs = [
+        "shoulder.py",
+    ],
+    legacy_create_init = False,
+    restricted_to = ["//tools:k8"],
+    deps = [
+        ":python_init",
+        "//aos/common/util:py_trapezoid_profile",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+        "@matplotlib",
+    ],
 )
 
 py_binary(
-  name = 'wrist',
-  srcs = [
-    'wrist.py',
-  ],
-  deps = [
-    '//aos/common/util:py_trapezoid_profile',
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "wrist",
+    srcs = [
+        "wrist.py",
+    ],
+    legacy_create_init = False,
+    restricted_to = ["//tools:k8"],
+    deps = [
+        ":python_init",
+        "//aos/common/util:py_trapezoid_profile",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+        "@matplotlib",
+    ],
 )
 
 py_library(
-  name = 'wrist_lib',
-  srcs = [
-    'wrist.py',
-  ],
-  deps = [
-    '//aos/common/util:py_trapezoid_profile',
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "wrist_lib",
+    srcs = [
+        "wrist.py",
+    ],
+    restricted_to = ["//tools:k8"],
+    deps = [
+        "//aos/common/util:py_trapezoid_profile",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+    ],
 )
 
 py_library(
-  name = 'shoulder_lib',
-  srcs = [
-    'shoulder.py',
-  ],
-  deps = [
-    '//aos/common/util:py_trapezoid_profile',
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "shoulder_lib",
+    srcs = [
+        "shoulder.py",
+    ],
+    restricted_to = ["//tools:k8"],
+    deps = [
+        "//aos/common/util:py_trapezoid_profile",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+        "@matplotlib",
+    ],
 )
 
 py_library(
-  name = 'arm_lib',
-  srcs = [
-    'arm.py',
-  ],
-  deps = [
-    ':wrist_lib',
-    ':shoulder_lib',
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-    '//aos/common/util:py_trapezoid_profile',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "arm_lib",
+    srcs = [
+        "arm.py",
+    ],
+    restricted_to = ["//tools:k8"],
+    deps = [
+        ":shoulder_lib",
+        ":wrist_lib",
+        "//aos/common/util:py_trapezoid_profile",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+        "@matplotlib",
+    ],
 )
+
 py_binary(
-  name = 'arm',
-  srcs = [
-    'arm.py',
-  ],
-  deps = [
-    ':wrist_lib',
-    ':shoulder_lib',
-    '//external:python-gflags',
-    '//external:python-glog',
-    '//frc971/control_loops/python:controls',
-    '//aos/common/util:py_trapezoid_profile',
-  ],
-  restricted_to = ['//tools:k8'],
+    name = "arm",
+    srcs = [
+        "arm.py",
+    ],
+    legacy_create_init = False,
+    restricted_to = ["//tools:k8"],
+    deps = [
+        ":python_init",
+        ":shoulder_lib",
+        ":wrist_lib",
+        "//aos/common/util:py_trapezoid_profile",
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+    ],
+)
+
+py_library(
+    name = "python_init",
+    srcs = ["__init__.py"],
+    visibility = ["//visibility:public"],
+    deps = ["//y2016/control_loops:python_init"],
 )
diff --git a/y2016/control_loops/python/__init__.py b/y2016/control_loops/python/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/y2016/control_loops/python/__init__.py
diff --git a/y2016/control_loops/python/intake.py b/y2016/control_loops/python/intake.py
index d99160d..02c1ada 100755
--- a/y2016/control_loops/python/intake.py
+++ b/y2016/control_loops/python/intake.py
@@ -5,7 +5,6 @@
 from frc971.control_loops.python import controls
 import numpy
 import sys
-import matplotlib
 from matplotlib import pylab
 import gflags
 import glog
diff --git a/y2016/control_loops/python/wrist.py b/y2016/control_loops/python/wrist.py
index f08f1a2..6de8551 100755
--- a/y2016/control_loops/python/wrist.py
+++ b/y2016/control_loops/python/wrist.py
@@ -4,7 +4,6 @@
 from frc971.control_loops.python import controls
 import numpy
 import sys
-import matplotlib
 from matplotlib import pylab
 import gflags
 import glog