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.
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