Relevant VAX conversion code is in convert.cc.

SCHWED-4612: Set OpenGL GL preferences, new Python module name for sip in check if sip is installed.

SCHWED-4612: Get rid of some Numpy warnings, move from np.matrix to np.array, keeping the matrix variant as deprecated method.

The reason is that the check just scratches floating point accuracy and
occasionally failed on some machines

SCHWED-4612: Ignore warning about unused functions by GCC, while the functions are used by unit tests.

This reverts commit ef7bfdb6.

Didn't work with Sphinx 1.6.7 which needs an extra option at the start.
This needs to be fixed cleanly, or we need to upgrade the Sphinx version
requirements