fixes issue #455 Creating an archive generates an exception on Windows - reverted the FileIter implementation as it had the same issue on windows and probably on unix as ref #448
"""Various utilities to work with Python < 2.7.Those utilities may be deleted once ``vcs`` stops support for older Pythonversions."""importsysifsys.version_info>=(2,7):unittest=__import__('unittest')else:unittest=__import__('unittest2')