sshrepo: don't quote obviously safe strings (
issue2983)
This restores compatibility with hg-over-ssh servers that don't parse
commandlines as sh does but works ok in the most common cases.
bookmarks: update and updatecurrentbookmark return status
This makes bookmarks.update() and bookmarks.updatecurrentbookmark() return
True or False to indicate whether the bookmark was updated or not. This allows
callers to e.g. abort if the update failed.