more #H4407 - #loot vs cockatrice corpse

Previous fix was 'me' to eat from inventory without checking current
location for edible items.  The report describing the need for that
also mentioned that you could #loot while blind and without gloves
and not touch any objects except for the container you pick to loot.
This adds a corpse touch check, plus `m#loot' to skip floor containers
and go directly to using #loot for adjacent saddled creature.  That,
as well as the open command, will reveal adjacent container in some
circumstances but I'm going to pretend that that doesn't matter.

doloot() has turned into spaghetti.  We should probably add #unsaddle
or something of the sort and return #loot to container-access only.

src/cmd.c

@@ -3455,6 +3455,9 @@ int NDECL((*cmd_func));
            an item on floor or in invent; 'm' skips picking from floor
            (ie, inventory only) rather than request use of menu operation */
         || cmd_func == doeat || cmd_func == dosacrifice || cmd_func == doapply
+        /* 'm' for removing saddle from adjacent monster without checking
+           for containers at <u.ux,u.uy> */
+        || cmd_func == doloot
         /* 'm' prefix allowed for some extended commands */
         || cmd_func == doextcmd || cmd_func == doextlist)
         return TRUE;