* DB_WRITE now called DB_MASTER, DB_READ now called DB_SLAVE
* Converted to use SQL wrapper functions instead of direct SQL in various places
* Experimental method for preserving the chronological order of events when slave servers are used. Untested.
* Fixes to the new post-parse existence test feature
* Some.. other stuff
available. Currently using for the message cache to avoid reading
every message separately. This now is only slightly slower than
memcached in my tests when $wgUseDatabaseMessages is enabled, so
it's a bit of a speedup for common hosts.