* Completed the code to revert a wiki page to a previous version with just one click...

* Completed the code to revert a wiki page to a previous version with just one click.  Combined with the previous commit, the code paths for 'view' and 'revert' operations are now unified in both citserver and webcit.
* Re-enabled the ability to create Wiki rooms.  Our wiki module is now functionally complete in a barebones sort of way, and the on-disk format is finalized.  I will probably add some more bells and whistles (such as 'compare versions') before the final release.