tigefa4u projects Trac

Implemented user configurable ticket status transitions via the
{{{[ticket-status]}}} and {{{[ticket-actions]}}} TracIni sections. Details
[http://trac-hacks.org/ticket/128 here].

Copied sandbox workflow.
Initial commit of workflow patch from [http://trac-hacks.org/wiki/WorkFlowPatch Trac Hacks].

TracCrossReferences: improve a bit the ''Cross-references'' page layout.

TracCrossReferences: merged changes from trunk (log:trunk@...:2780)

sandbox/notification
* Split notification implementation into generic and ticket-specific files
* Additionnal bug fixing in unit tests
* Preparing for merging into trunk

InterTrac: some code simplification and additional comments

InterTrac: slight modification of the Wiki syntax for WikiPageNames.

In a text like `MeatBall:InterMapTxt`, this allows the `MeatBall:` part to be
recognized as a "protocol" (and afterwards as an InterWiki prefix) instead of
a Wiki page name followed by a ":".

All wiki tests still pass unchanged.

InterTrac: merged in changes from trunk (log:trunk@...:2780)

Most of the features are still functional, though there are some issues with InterWiki links...

Created workflow sandbox.

TracDiff refactoring: simplified the `IRequestHandler` methods

* Only operate on `/changeset`, not on `/diff` anymore
* Made first changeset argument optional. Therefore, a request
to `/changeset` will go the HEAD revision.
* The first changeset argument can now be anything upto the next "/".
This allows for URLs like `/changeset/HEAD` or `/changeset/latest`,
as well as being more friendly to other VersioningSystemBackend
(e.g. `/changeset/tip` or `/changeset/0d36e3d7e2ea`...)