add old bones to the underworld

df_mapitems/mod.conf

@@ -1 +1,4 @@
-name = df_mapitems
+name = df_mapitems
+description = Various node types used by the dfcaverns mapgen mod. Includes cave coral, flowstone, glowing crystals, glow worms, moss and fungi ground cover, and snare weed.
+depends = default, subterrane
+optional_depends = df_farming, farming, intllib, doc, radiant_damage