Clean up ceiling nits.

Fixes C343-102.

doc/fixes35.0

@@ -914,6 +914,7 @@ scare monster scroll now provides a better effect
 monsters without hands can no longer pick up piles of objects (with 
     certain exceptions)
 uncursed enchant weapon now correctly fixes erosion
+scroll of earth messages cleaned up
 
 
 Platform- and/or Interface-Specific Fixes

src/engrave.c

@@ -233,7 +233,7 @@ register int x, y;
              || IS_DOOR(lev->typ) || lev->typ == SDOOR)
         what = "ceiling";
     else
-        what = "rock above";
+        what = "rock cavern";
 
     return what;
 }

src/read.c

@@ -1532,14 +1532,17 @@ struct obj *sobj; /* scroll, or fake spellbook object for scroll-like spell */
         break;
     case SCR_EARTH:
         /* TODO: handle steeds */
-        if (!Is_rogue_level(&u.uz)
+        if (!Is_rogue_level(&u.uz) && has_ceiling(&u.uz)
             && (!In_endgame(&u.uz) || Is_earthlevel(&u.uz))) {
             register int x, y;
             int nboulders = 0;
 
             /* Identify the scroll */
-            pline_The("%s rumbles %s you!", ceiling(u.ux, u.uy),
-                      sblessed ? "around" : "above");
+            if (u.uswallow)
+                You_hear("rumbling.");
+            else
+                pline_The("%s rumbles %s you!", ceiling(u.ux, u.uy),
+                          sblessed ? "around" : "above");
             known = 1;
             sokoban_guilt();