Include revision in View Diff summary head of files
Review Request #1178 — Created Oct. 23, 2009 and discarded — Latest diff uploaded
See original change/review http://reviews.reviewboard.org/r/579 which was against svn (and older code). Updated with David Trowbridge's idea to implement and use new SCMTool.format_revision() function for formatting Revisions.
Tested with SVN and another SCM (that uses integers for rev id's) that is not officially supported by ReviewBoard