doomed quest

Your quest leader would tell you to return later, even after you
were converted, which would be futile, and could mislead new
players.

This patch:
1. Causes the quest leader to banish you the first time you
encounter him/her following a conversion, since you cannot ever
complete the quest anyway in the current game.
2. Adds a new general QT_BANISHED message to be delivered, in
which you are told that you won't be able to get the Amulet without
the Bell now.

This helps resolve the complaint about not knowing that your game
cannot be won.

doc/fixes34.1

@@ -230,6 +230,8 @@ kicking a tree could produce 0 to 4 killer bees but it should have been 1 to 5
 mounting a steed allowed hero to make moves that would otherwise be disallowed
 	including mounting diagonally in a shop doorway
 monsters lose intrinsic speed when pertrified
+if you have converted, the quest leader banishes you instead of asking you
+	to come back later, and tells you that you won't succeed without Bell
 
 
 Platform- and/or Interface-Specific Fixes