help: add documentation on include: and subinclude: Adds some help text about the new include: and subinclude: match syntax.

match: enable 'subinclude:' syntax This adds a new rule syntax that allows the user to include a pattern file, but only have those patterns match against files underneath the subdirectory of the pattern file. This is useful when you have nested projects in a repository and the inner projects wants to set up ignore rules that won't affect other projects in the repository. It is also useful in high commit rate repositories for removing the root .hgignore as a point of contention.

copies: switch to using pathutil.dirname copies had it's own dirname implementation. Now that pathutils has a common one, let's use that instead.

pathutil: add dirname and join functions This adds dirname and join functions to pathutil which are explicitly for handling '/' delimited paths. The implementations are basically copy paste from python's posix os.path.dirname and os.path.join functions.

changelog: move index_get_parents function up index_get_parents can be used in index_headrevs, to do so it needs to be moved up in the compilation unit.

mergecopies: avoid slowdown from linkrev adjustment (issue4680) checkcopies was using fctx.rev() which it was expecting would be equivalent to linkrev() but was triggering the new _adjustlinkrev path. This was making grafts and merges with large sets of potential copies very expensive.

hgweb: remove an extra call to nodebranchnodefault() in changesetentry() showbranch variable already contains the result of nodebranchnodefault(ctx), so it can be reused.