Add ui method to set --ssh/--remotecmd, use it in init/clone/pull/push/in/out.
The only user visible change is that 'hg init' now accepts this options, too.
adding foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
pushing to ../2
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files