cf (0.91.5) - bug in comet spell (nasty)

[Tero Jyri Michael Pelander <tpeland@utu.fi>]

Ok.  While playing with the comet spell I wondered how many of them it would
take to kill a jessy.  I started testing this using the dm mode to
create a test character.  What I found out was that
  !!! when you have high enough level the initial impact from
  !!! comet (weaponmagic attack) heals you!!!!

For example at level 68 (int 30) it heals you 232 hitpoints.  At level 89 it
heals about 200 hits.  This heal can push your hitpoints over the maxinum.
Specially as there exists spell immunity to fire that will negate the
secondary attack the players can pump up the hitpoints with this.

Btw. my real crossfire character is at level 68.