Increased carrying capacity, other small changes

Increased max items to 100 (up from 30).
Increased max spells in memory
to 20 (up from 10).
Increased carrying capacity for powerups to 50 (up
from 20).
Removed parasite attack animation when idenitfy is used.
All
classes now have the same baseexp and exp per level (ultipliers (3000
and 1.0x).
Reduced exp to normal levels (but still higher than regular giex).