Makefile: remove generated mercurial/__version__.py

mq: rename --check into --keep-changes I named it --check because it felt like qpush & co were checking *more* things to ensure local changes could not be lost. But it has been pointed on the mailing list that --check is already used by update command with a meaning almost opposite to this one. An alternative was --keep but qfold and qdelete already have such an option to preserve patch files and qfold may be a candidate for --check. - qpush/qpop/qgoto --check becomes --keep-changes. - mq.check becomes mq.keepchanges. - The short option -c is dropped as -k may conflict with existing --keep. The availabilitity of mq.keepchanges should not make this too painful. - Fix minor reST mistake in option description.

parsers: use Py_CLEAR where appropriate

largefiles: fix addremove when largefile is missing (issue3227)

tags: short-circuit if no tags have ever been committed

largefiles: fix default clone destination regression