Spell work; minor tech tree rearrangements

Spells included in tech tree. Added EaPlotEffects.sql in preparation for
spell plot effects. Other minor spell and spell promotion changes.
Merge pull request #2 from ls612/master

SQL support for NW Happiness
Removed Natural Wonder happiness kludges
Spell bug fix
Merge branch 'master' of https://github.com/Pazyryk/Ea_III_Sword_and_Sorcery