fixed vcs issue with last_changeset for filenodes - fixed incosistency for displaying revision in file browser - fixed raw_diff for git for single file mode - file block now uses associated changeset for both git&hg
"""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')