patches: new RW33 series by Korp. [dark version] (#1068)

See discussion in #1049.

If RW33_5 really is extraneous we can still get rid of it; otherwise it is now METAL9.

I've also taken the liberty of moving one of my recent textures.cfg additions to their proper place in the "Custom textures using resources of freedoom" section.

lumps/textures/textures.cfg

@@ -1692,8 +1692,6 @@ BIGDOOR6        128     112
 *   DOOR11_1    -48     0
 *   DOOR11_1    32      0
 *   DOOR11_1    5       0
-BIGDOR6A        128     128
-*   BROWN4      0       0
 BLODRIP1        32      128
 *   RP2_1       0       0
 BLODRIP2        32      128
@@ -3597,6 +3595,9 @@ ESPIG3         128    128
 *   ESPI19_4     0      0
 
 ; Custom textures using resources of freedoom.
+BIGDOR6A        128     128 ; BIGDOOR6 in 128x128.
+*   BROWN4      0       0
+
 BROVINE2        256     128 ; Another Brovine, using the real brown halls.
 *   WALL62_1    0       0
 *   WALL62_1    128     0
@@ -3680,7 +3681,11 @@ M_BDOOR         128     128 ; TNT keyed door, it was missing the blue version.
 *   W46_37      75      22
 *   W46_37      108     22
 
+METAL8          64      128 ; METAL2 but 8 little squares.
+* RW33_6        0       0
 
+METAL9          64      128 ; METAL3 with no markings or panels.
+* RW33_5        0       0
 
 PIPE3           256     128 ; Unused textures in doom beta, now has vines on freedoom.
 *   TP2_1       0       0