ignore: use 'include:' rules instead of custom syntax Now that the matcher supports 'include:' rules, let's change the dirstate.ignore creation to just create a matcher with a bunch of includes. This allows us to completely delete ignore.py. I moved some of the syntax documentation over to readpatternfile in match.py so we don't lose it.

match: add 'include:' syntax This allows the matcher to understand 'include:path/to/file' style rules. The files support the standard hgignore syntax and any rules read from the file are included in the matcher without regard to the files location in the repository (i.e. if the included file is in somedir/otherdir, all of it's rules will still apply to the entire repository).