tigefa4u projects Trac

Fixed search: link syntax. Fixes #1937.

Make sure we generate a valid rpm spec files. Closes #1141 (again).

TracDiff: 2 small fixes
* ''Last Changes'' link in the Browser was using the current rev,
not the ''created rev'' as it should have
* fixed diff arguments for the alternate format links in the Diff view

InterTrac branch: fixed InterWiki macro (that macro is now used in the default InterMapTxt page)

HTML-escape old/new values in ticket changelog.

InterTrac branch: some enhancements for the InterWiki support
* InterWiki definitions in InterMapTxt support trailing comments
(which are subsequently shown in links titles)
* added `Trac` in InterMapTxt, to demonstrate the above feature
and also how to pass multiple arguments to InterWiki links (#1414)

InterTrac: merged with TracDiff (log:branches/cboos-dev/anydiff-branch#2088:2095)

TracDiff: unified diffs produced by Trac now correctly support added files

TracDiff:
* The ''Restricted Changeset'' view is now accessed through the `ChangesetModule`
* some minor cosmetic fixes

TracDiff: changed the Web interface for generalized diffs.

Now, the browser has a ''Diff ...'' button which leads to a page
containing a simple form with 4 text fields, enabling the
selection of the base path/rev and target path/rev.