Issue resolving relative lib_dependency path on Windows

[jdhughes-usgs]

On Windows:

xmiobj = xmipy("../path/to/dll")

results in OSError: [WinError 87] The parameter is incorrect

This can be resolved by modifying

xmipy/xmipy/xmiwrapper.py

Line 108 in bff6ccc

os.environ["PATH"] = lib_dependency + os.pathsep + os.environ["PATH"]

to

os.environ["PATH"] = str(Path(lib_dependency).absolute()) + os.pathsep + os.environ["PATH"]