MDL-22950 fixed regression - files in subdirectories not found; big thanks to Dongsheng for spotting this

message MDL-22803 Improved message searching to better handle tiny search terms and the huge result sets they generate

Course MDL-23062 turned off $doanything super admin power for a editing capability check to effect a switched to role from admin.

MDL-19776 make sure contexts are fully initialised after each core upgrade, it is relatively cheap, so it should not cause any problems

MDL-23106 all tables created in upgrade.php MUST be present in install.xml - we will most probably drop the two old blocks tables before release but we can not allow exceptions like this, sorry