Healing Rebalance

Healing spells were given a wonky addition under NDS that prevented them
from being used on Qors (they'd heal worse and lower the caster's
karma). It was an attempt to stop heal muling, but it didn't work. We
can do that a better way.

* Heal spells no longer factor in target's karma.

* Heal spells are now based mostly on spellpower, like they should have
always been. You will find them being far less effective under AMA or
Dement than before.

* All heal spells are now instant (no focus). Focus is a bad design
mechanic, and it made Minor Heal and Hospice unusable.

* Heal spells can no longer fizzle. First, because oh my god the fizzles
on Minor Heal are enough to drive anyone insane. Second, because their
effect is based on spellpower, so casting under AMA will heal nothing
anyway.

* Added vigor costs to Hospice and Major Heal; but Minor Heal vigor cost
is now zero. The different spells now have different balances depending
on whether you want reagent efficiency, time efficiency, or mana/vigor
efficiency.

Overall, this is a mixed bag of buffs and nerfs, but I think the outcome
is a satisfying series of usable spells that players won't be annoyed to
fight with or against.