scm: mercurial: add Mercurial helper extension (#4455).
* 'rhsummary' and 'rhmanifest' for reducing the number of hg command calls. * 'rhdiff' for compatibility with Mercurial < 1.1. Also renamed TEMPLATES_DIR to HELPERS_DIR because the directory now contains templates and a helper extension. Original version was written by Alessio Franceschelli, downloaded from http://www.redmine.org/attachments/3395/overhaul.py Contributed by Alessio Franceschelli and Yuya Nishihara. git-svn-id: https://svn.redmine.org/redmine/trunk@4833 e93f8b46-1217-0410-a6f0-8f06a7374b81
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