context: fallback function should not return None

test-subrepo-svn: fix strange svn behaviour on windows I got a full path when pusing the external like: Sending C:/foo/bar/test-subrepo-svn/sub/t/s/alpha instead of the relative path

tests: force color ansi mode on Windows

acl: improve undefined group error handling

test-acl: avoid $HGTMP on windows sed does not like colons and there are other path normalization issues.

acl: grp module is not available on windows

convert/svn: report path discovery progress When converting non-local repositories, scanning changed paths before retrieving data can be almost as slow as retrieving the data itself, thanks to HTTP calls overhead.

convert: display files data retrieval progress

convert: add progress support

convert: merge sources getmode() into getfile()

convert/svn: remove useless sort

convert/svn: list files explicitely, stop checking their type We do not care about directories when looking for recursively added or removed items, and the redundant _checkpath() call is expensive with remote repositories.

acl: clarify acl.sources, fix typo

convert/svn: remove unused variable

Merge with crew-stable