rotateDibFree

Definition: a32Dib0 newdib = rotateDibFree(a32Dib dib, integer angle, object bgcolor, integer kill_old)
Description: Rotates the bitmap and returns the new bitmap.
Comments: Returns 0 if the bitmap could not be rotated.
angle is in degrees.
angle will NOT be rounded (free angle rotation).
If bgcolor is a color-sequence, that color is used to fill the region outside the rotated bitmap.
If bgcolor is an atom (not a color-sequence), then the original bitmap will be wrapped/tiled.
If kill_old!=0 then the previous bitmap will be killed.