fix qclone to a remote repo This fixes issue467. -stable still needs something like revision 55578a8d7e84 - mq: allow push if -r is given explicitly. In the meantime, hg qpop -a; hg qclone . ssh://... is a workaround.

Save an absolute path in repo.path This should keep things working if the process changes directories after creating a repo object.

merge with crew-stable

Add tests for .hg/branches.cache feature list.

Add a features list to branches.cache to detect caches of old hg versions. The leading space in the written file makes sure that the feature list never can match an existing version, even if the first feature can be read as hex. Additionally old hg versions display the id with --debug, too.

Store empty (default) branch in branch cache, too. Operations on this branch don't work otherwise. Reading branches.cache had to be adjusted to allow an empty label. Adjusted reading of the cache tip for symmetry, no functional change here.