missing altar drop messages

Most callers of dropx did not check for altars, but should have.  Rather
than add such checks, I moved the check from drop to dropx.  I also found
several callers of dropx that could generate out-of-order messages for some
cases (not new) and fixed them. FYI - callers of dropy don't seem to want
altar checks or already do them.

doc/fixes34.1

@@ -329,6 +329,7 @@ non-moving monster are not affected by liquid
 'A' command wouldn't remove cursed item from quiver or alternate weapon slot
 'A' command behaved differently depending on menustyle when non-weapons were
 	present in the quiver or alternate weapon inventory slots
+most cases of the hero dropping things need to check for dropping on an altar
 
 
 Platform- and/or Interface-Specific Fixes