Ninjas can now phase jaunt.

Adds phase jaunt for a cost of 250 energy, compared to phase shift which costs 400E.
Randomly jumps the ninja 5-9 tiles straight ahead.
Cell use is now redacted directly in the ninjacost() proc.
Some cleanup of ninja verb-add/removal.
Merge pull request #6319 from PsiOmegaDelta/IAmNinja

Ninjas can now phase jaunt.