libmanage: rename volume to 3draster

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@63218 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/manage/element_list

@@ -14,7 +14,7 @@ cell:raster:raster:raster map(s)
   cell_misc:misc
   fcell:fcell
   g3dcell:g3dcell
-grid3:volume:3D raster:3D raster map(s)
+grid3:3draster:3D raster:3D raster map(s)
 vector:vector:vector:vector map(s)
 dig:oldvector:old vector:old vector map(s) (GRASS 5.0) 
   dig_att:attributes