farlook vs "wall of lava"

Implement a couple of missing bits for wall of lava terrain.  It was
immune to being distorted by hallucination, unlike molten lava and
wall of water.  And the presence of wall of lava made molten lava,
after being shortened to "lava", no longer be listed as something
represented by the "}" character.

I started to renumber S_water, which would eliminate some hackery
from farlook's do_screen_description(), but that will require an
EDITLEVEL increment and make it necessary to reorder/renumber the
corresponding tiles so I stopped short.

This adds NHDT tags to the first line of defsym.h.

doc/fixes3-7-0.txt

@@ -1987,6 +1987,9 @@ sometimes a repeat count from the preceding command carried over to most
 if peaceful monsters react when seeing hero attack a peaceful monster, don't
 	have quest guardians run away; also, quest leader only becomes angry
 	if the monster being attacked is a quest guardian
+farlook of water/lava location listed wall of lava before molten lava; because
+	of that, lava was omitted ("molten" suppressed to reduce vebosity,
+	resulting in "lava" which got skipped as substring of "wall of lava")
 
 
 Fixes to 3.7.0-x Platform and/or Interface Problems Exposed Via git Repository