tigefa4u projects Trac

Edgewall's Trac can now also render its own Wiki formatting for files stored in the repository. Let's make the set of default wiki pages benefit from that feature. That way, eventual formatting errors can be spotted directly from the main repository.

Added a slightly more user-friendly concurrent wiki editing detection. This also closes #1739.

As Edgewall's Trac now support rendering reStructuredText files in the TracBrowser, I noticed I forgot to set the property to on the RELEASE file.

Make the `search:` link syntax consistent with the `query:` one.

That is, one can construct complex search queries by starting the query
argument with a `?` sign, followed by the search query parameters
as they would appear in the URL.

E.g. `search:?q=link+syntax&wiki=on` will prepare a link for
searching about ''link syntax'' in the wiki pages only.

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)