sshpeer: rename 'size' to 'data' in doublepipe We are about to add 'write' support, the argument will be either an int or a string.

mq: ban \r and \n in patch names (issue4711) This is at best crazy, and at worst will break things like the series file. Let's just stop the madness.

mq: use %r to format illegal characters instead of manually quoting This will make it easier to ban \r and \n in the next patch and still have a sensible error message.

histedit: abort rather than edit a public changeset (issue4704) This is suboptimal as the user still has to explicitly cancel the histedit afterwards, but it prevents the immediate problem. histedit should probably implicitly do 'hg histedit --abort' if a util.Abort is raised internally.