revlog: split a `_revisiondata` method to file `revision` job We are about to introduce more public method to access revision data (eg: `rawdata`). revset subclass tend to recursively call `revision` which will create all kind of issue with the coming series. To avoid them we introduce an explicit difference between the internal call and the public all. This will be useful for later work anyway (so the subclass issue is just moving it earlier in the series). I am not sure if the subclass are actually doing something sensible. However, I am certain I don't want to be rabbit holed into figuring it out right now.