Provide --guess-description and --guess-summary for Mercurial revision ranges

Review Request #1333 — Created Dec. 28, 2009 and submitted — Latest diff uploaded

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RBTools

Reviewers

Extracts all commit messages from the repository and concatenates them to form the description. For the summary, the first line is picked.
We have been running a slightly edited version of this in production for months.

In diff r3: Tested the diff_between_revisions functionality.