psionics nerfs

Things we can do to nerf psionics:
(Implement some, all, or none)
- Decrease the PP that psions have or increase PP costs across the board
- Make max rank dependent on level/paths/something else than intelligence modifier.
- Make PP more difficult to regenerate
- You don't start with your PP generator, you get it by leveling (maybe they get it when martials get Savant?)
- Psions don't know all their subpowers at the start of the game.
- Actual ranges on psionic powers
- Probably some other stuff as well