GitLab

* Improve vec3

* Added a ``__neg__`` operator overload so that -Vec3(1, 2, 3) returns
  the same thing as Vec3(-1, -2, -3)
* Derived Vec3 from namedtuple instead of tuple. This allows you to
  access the 3 elements of the vector by name. i.e., vec.x, vec.y, vec.z

* Make sure we use floating point division all the time.

Clean up

Fix OpenCL platform on low-end devices

Close file before deleting in TestAmberPrmtopFile.py

Close PDBx file before deleting to fix windows test failure in TestPDbxFile.py

Fix test checkpoint reporter close file before repoening

Add bytes typemap

Update appveyor.yml

Fix exit status

Supress 4305 and 4244 warnings

Print the last failed tests output

Make numpy optional in test

Improve scipy skip too

Refactor TestCheckpointReporter.py to not require numpy

test on the proper file

Remove annoying -V

Add a test for the various numpy attributes (and the arguments they take) for
the unit module.

Traceback (most recent call last):
  File ".../python/tests/TestNumpyCompatibility.py", line 87, in testNumpyAttributes
    d = self.data.reshape((100, 3))
  File ".../simtk/unit/quantity.py", line 575, in reshape
    return Quantity(self._value.reshape(shape, order=order))
  File ".../simtk/unit/quantity.py", line 142, in __init__
    if value == first_item:
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

Also add a test for new unit numpy capabilities.