mq: ignore subrepos (issue2499) If MQ allows modifying .hgsub or .hgsubstate in a patch, it can easily lead to an inconsistent subrepo state. This patch prevents qrefresh from adding any modifications to .hgsub or .hgsubstate to a patch. The user is warned that these files are not included in the patch. The tests test both the slightly irrational and the pathological cases.