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.
abort: repository a not found!
255
abort: error: Connection refused
255
abort: repository a not found!
255
abort: destination '../a' already exists
255
abort: repository a not found!
255
abort: destination 'q' already exists