tigefa4u projects Trac

TracCrossReferences: merged changes from trunk (log:trunk@...:2366)

TracCrossReferences: removed the TracDiff and InterTrac features from that branch

Now, this only contains the xref stuff (that is, plenty enough changes :) )
on top of the source:trunk@...

TracCrossReferences: started the implementation of the <<...>> wiki syntax for creating arbitrary relations between !TracObjects

i.e. if in Ticket !#2, one writes: `<<duplicate-of #1>>`, then a `duplicate-of` relationship is created,
with ticket !#2 being the source and ticket !#1 being the target.

Moved the flexible WikiPageNames scheme from InterTrac to FlexibleWikiPageNames, and updated it to the newest way of enabling/disabling plugins

FlexibleWikiPageNames branch: this branch will focus on implementing the flexible WikiPageNames scheme that can currently be found in InterTrac

InterTrac: merged changes from trunk (log:trunk@...:2361)

InterTrac: removed the TracDiff feature from that branch.

This branch will now only contain the InterTrac, InterWiki
and extended InterWiki links (see #1414) as a diff on the trunk
(currently on r2319).

Clean-up of branches/cboos-dev

make `Component.__getattr__` show the class name as well as the attribute name when the attribute does not exist

Applied a slightly modified patch from Emmanuel Blot that makes trac-admin use the PermissionStore API. Closes #2223.