Issue #287 Ignore .pyc files in src/cmake/ directory.

The check whether all files in the src/cmake/ directory are going to be installed triggered a false alarm for the get_python_lib.pyc file.
Merge branch 'refs/heads/bugfix/#287-ignore-pyc-files-in-source-tree' into develop
Issue #286 Warn if Python version string cannot be parsed.

Though the reason in the encountered case was a user mistake, it might be helpful for the user to get a clear warning regarding what may have triggered the subsequent CMake list index out of range error.
Merge branch 'refs/heads/bugfix/#286-warn-if-python-version-cannot-be-parsed' into develop