* Scm.php: new SCM method "getChanges" which returns all available
change information grouped by type
* Monotone.php: implement getChanges via get_revision
* <other scms>: rename "changes" member for getCommit to "diff" which
matches better
* Source.php: query the commit's changes and set them in the template
* commit.html: render the changes, type-by-type. Link to the tree or
the individual diff if applicable
* styles.css: some initial style sheet work
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