New: familiars can have a LUA initialization function.
Moved the spell implementations from spell.c to spells.c where they "belong".
Spell ids moved to a separate header (to phase them out eventually)
"equipment-sets" in the XML definition files (equipment.xml) can define skills and items for a unit. these can be applied using the equip_unit() function (from both LUA and C).
I've rewritten the random first encounters and addplayer() functions to use these. As a result, there's now even less dependency on fixed item types in the source, and I can take more items out.
