Version discovery from git not working in tests

[sannant]

Not sure this is relevant once SurfaceTopography is installed properly in devel version, but the following line will raise an error if the tests are run in the test subdirectory.

I think a better option would be to call git and check that the package name is SurfaceTopography

SurfaceTopography/SurfaceTopography/DiscoverVersion.py

Line 37 in 6808a71

if not os.path.exists('.git'):