monster aggravation spell

When testing drawbridge stuff recently I ended up with an unseen
monster who evidently cast the aggravation spell repeatedly, yielding a
steady stream of "you feel that monsters are aware of your presence"
messages.  This patch makes monsters tend to avoid repeating that spell
once everyone on the level has already been woken up.  It also extends
the spell effect so that it will wake monsters like quest nemesis and the
Wizard who ordinarily wait until you get close before they become active.

doc/fixes34.4

@@ -99,6 +99,8 @@ land mine explosion will destroy a drawbridge at same location
 avoid some more buffer overflows in query buffers containing object names
 avoid giving extra information about things that break out of sight
 avoid giving away wand type for near misses while blind
+avoid excessive repetition of "monsters are aware of your presence"
+monster's aggravation spell now affects meditating monsters
 
 
 Platform- and/or Interface-Specific Fixes