far-look which swallowed

Change description of area outside of the swallow animation from
"interior of a monster" to "unreconnoitered".  For the animation
characters themselves, don't suppress the list of other screen
features which use the same character ('/' for wand and so on).
Add a data.base entry for "unreconnoitered" in case someone tries
to use it to look up an unfamiliar term.

dat/data.base

@@ -5231,6 +5231,9 @@ unicorn horn
 	warm glow stage, then I use my horn to burn off any excess and
 	keep me right there."
 		[ Unicorn Variations, by Roger Zelazny ]
+unreconnoitered
+	Area of map which is beyond limited perception range when
+	underwater or engulfed by a monster.
 valkyrie
 * valkyrie
 	The Valkyries were the thirteen choosers of the slain, the