From entrez: Have fake players respond to #chat via verbalize() rather
than pline() since those responses are spoken.
Closes #665
falling down a hole or trapdoor will cause damage proportional to fall height
stinking gas clouds block line-of-sight
covetous monsters will teleport to downstairs or upstairs to heal
+have fake player monsters use verbalize instead of pline when reacting to chat
Fixes to 3.7.0-x Problems that Were Exposed Via git Repository