is_lminion should only match lawful minions

When Angels were introduced, they were always lawful.  Somewhere along the
line, non-lawful angels were added, but is_lminion and uses of it was never
updated to address this change.  Among other things, this resulted in
non-lawful angels delivering messages via #chat that are only appropriate
for lawful angels.  That is addressed simply by changing the definition of
is_lminion, which must take a struct monst, not a permonst, to return valid
results.  Also, non-lawful angels should summon appropriate monsters, not
lawful minions.

doc/fixes34.1

@@ -288,6 +288,8 @@ breaking wand of digging on a drawbridge shouldn't dig/hole a pit in the bridge
 avoid mimicking gold when the character has the Unchanging attribute
 handle polearm wielded prior to mounting the same as one wielded while mounted,
 	and one still used after dismounting like one wielded while not mounted
+non-lawful angels don't chat using lawful messages and shouldn't summon
+	lawful help
 
 
 Platform- and/or Interface-Specific Fixes