Corrected the error in which "splitpaint" and "spliterase" are

incorrectly applied to locked layers, as reported by Mark Martin
in issue #95 on github.

commands/CmdRS.c

@@ -2732,6 +2732,9 @@ CmdSplit(w, cmd)
     if (!CmdParseLayers(cmd->tx_argv[2], &mask1))
         return;
 
+    /* Remove any inactive layers */
+    TTMaskAndMask(&mask1, &DBActiveLayerBits);
+
     if ((direction = GeoNameToPos(cmd->tx_argv[1], FALSE, TRUE)) < 0)
 	return;
 
@@ -2842,6 +2845,9 @@ CmdSplitErase(w, cmd)
     if (TTMaskIsZero(&mask))
 	return;
 
+    /* Remove any inactive layers */
+    TTMaskAndMask(&mask, &DBActiveLayerBits);
+
     direction = (direction >> 1) - 1;
     dir = (direction & 0x1) ? 0 : TT_DIRECTION;