Make hg paths and hg debugconfig work with -R/--repository option.
Commands that can use a repo, but don't need one, should be added
to the "optionalrepo" string, similar to the "norepo" string.
syntax: glob
*.elc
*.orig
*.rej
*~
*.so
*.pyc
*.swp
*.prof
tests/*.err
build
dist
doc/*.[0-9]
doc/*.[0-9].gendoc.txt
doc/*.[0-9].{x,ht}ml
MANIFEST
patches
mercurial/__version__.py
syntax: regexp
^\.pc/