fixed Virulent Disease info bug

fixed Epidemic not passing the disease immunity penalty
fixed Burning Hex trap
fixed set up summon bug with new nature summon regen stat
fixed impending doom not preventing regeneration
fixed corruption weapon ego


git-svn-id: http://svn.net-core.org/repos/t-engine4@5046 51575b47-30f0-44d4-a5cc-537603b46e54