Folding correction and missing import

util: disinfect lookup_reg strings (issue1126) lookup_reg could return Unicode strings, which would infect other strings and generate unexpected tracebacks. Spotted by Rémy Roy. Fold in silly nested function while we're at it.

test symlinks on symlink-capable os but non-capable filesystem (issue1149) The "real" way to test this is to mount a non-symlink-capable filesystem, and try working on it; however, I don't know how to mount filesystems as a non-priveleged user from within the testing framework. So instead, os.symlink is overridden to raise the exception that would be raised on such a filesystem.

util: set_flags should survive failure to create link

util: set_flags shouldn't know about repo flag formats

Merge with stable Simplify the copy search algorithm

add a fix for issue 1175 If we copy a file followed by an update, it's possible for the parent manifest to no longer contain the source file of the copy, which could cause commit to fail. If this happens, we search backwares from the first parent to find the most likely original revision.

commit: simplify file copy logic

Make test-convert-mtn pass on systems where mtn add -R uses different order

Add ancestors and descendants to revlog This patch adds two methods to revlog: - ancestors: given a list of revisions returns their ancestors - descendants: given a list of revisions return their descendants