Empty damage object when freeing pixmap.

Wrap InstallColormap so that the DDX doesn't see colormaps from our ARGB
    visual (avoids lovely green tint to screen). Also, set visual->nplanes
    of ARGB visual to all used (including alpha) planes so DIX can set
    pixel values correctly.
Translate automatic update regions correctly to account for borders
When nplanes == 32 (ARGB visuals), mask in all ones for alpha values to
    allocated pixel values.
Remove redundant fbAddTraps declaration
Fix fbCopyWindow to work on non-screen pixmaps (not needed yet)
Replace broken clipping code with that from modular tree.
Respect subWindowMode.

composite/compalloc.c

@@ -460,6 +460,7 @@ compFreePixmap (WindowPtr pWin)
     {
 	DamageUnregister (&pWin->drawable, cw->damage);
 	cw->damageRegistered = FALSE;
+	DamageEmpty (cw->damage);
     }
     /*
      * Move the parent-constrained border clip region back into