interhg: allow more flexible pattern specification (fixes 2/3 of issue699)
- something else than "pat" followed by a number can be used as key
- something else than "/" can be used as delimiter
- "ilmsux" flags (e.g. "i" for case insensitive) can be used
assuming destination git-repo-hg
initializing destination git-repo-hg repository
scanning source...
sorting...
converting...
1 t1
0 t2