* Removed now unused "data" pointer facility from WadDirectory
* Don't populate defaulted items when creating MetaTables from cfg_t structs. This not only lets potential inheritance work properly, but also saves memory by letting the default value return feature of the MetaTable::get* methods to take over.
* Added beta powereffect section, and artifact subtype enumeration. Some things are still muddled in my design, though, and I may need to rethink some stuff...

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2588 86ba831e-150c-0410-ab35-e06eaae15ed9