progress: flush stderr after clearing On python3, ui.stderr is buffered, it seems, so we need to flush it to actually get the progress bar off the screen. This is important since ui.write() will call into progbar.clear() if it thinks there's a progress bar on the screen, with the intent that the next thing it outputs is at the beginning of the line (instead of at the end of the progress bar line). Without the flush, we buffer up the clearing of the screen, and we get some really weird/corrupt output. Differential Revision: https://phab.mercurial-scm.org/D7784

rcutil: drop the `defaultrcpath()` method (API) The resource based code can service py2, py3 and an oxidized executable, so there's no reason to leave this around. It was flagged as an API change when it was introduced, so flagging it again. Differential Revision: https://phab.mercurial-scm.org/D7777