Fix failing tests
A number of tests failed, because there's check in the LSMTool source code on the version number of SciPy. This check breaks if the version number is
that of a release candidate. Now, I'm not sure why python setup.py test
pulls in a pre-release version of SciPy, but it easier to fix this in the
source code.
TODO: the use of distutils.version
is deprecated; it shoud be replaced with packaging.version
(see RAP-123)