Merge with crew-stable

update: allow -c to jump branches if clean

subrepo: use '/' for joining non-local paths

fetch: drop force arg for commit (issue1752) This appears to be unneeded and forces fetch commits to examine clean files.

Fix issue1679: path reconstruction in hgwebdir was mangling things badly

do not translate commit messages It is not very helpful to have 'Added tag %s for changeset %s' and similar messages translated into different languages when people work together using different locales. We now use English strings without support for translations. If needed, the user can still supply a custom string for most commands.