Revive commands.dispatch as a simple way to call hg from other pythons scripts. This was already used by hg-ssh and others and is really convenient if you just want a native equivalent of calling the command line version.

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
removing b
abort: update spans branches, use 'hg merge' or 'hg update -C' to lose changes