use os.path.normpath on repository paths, fixes #606
use os.path.normpath on repository paths, fixes #606

this does NOT fix absolute vs. relative path usage,
but as this also deals with remote paths, this can't be done in general.

mhubig/borg,raxenak/borg,edgimar/borg,RonnyPfannschmidt/borg,mhubig/borg,mhubig/borg,raxenak/borg,edgewood/borg,edgimar/borg,edgewood/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,edgimar/borg,edgimar/borg,edgewood/borg,raxenak/borg,RonnyPfannschmidt/borg,raxenak/borg,RonnyPfannschmidt/borg,edgewood/borg