Add some vomiting effects:
Trigger divine wrath if hero vomits at an altar's location. (What
about adding throne and maybe sink special effects too?)
If poly'd into a yellow dragon, breathe (acid) on self. (I'm not
sure why.)
If on ice and poly'd into an acidic form, melt the ice. Also,
change melt_ice() to give its message when melting happens at the
hero's location even if hero can't see.
Fixes#519Fixes#510
PatR
e9c813b6ba