Log Message:
Changes 0.9.22
- Added DLCAPS_ALPHA_RAMP: Alpha values for formats with one or two alpha
  bits can be chosen, i.e. using ARGB1555 or ARGB2554 the user can define
  the meaning of the two or four possibilities. In short, this feature
  provides a lookup table for the alpha of these formats.
- Added DLCAPS_PREMULTIPLIED indicating that a display layer
  can display surfaces with premultiplied alpha.
- Added DSCAPS_PREMULTIPLIED indicating that the surface has
  premultiplied alpha data.
- Added DLCONF_SURFACE_CAPS and field 'surface_caps' to DFBDisplayLayerConfig 
  to specify any combination of the flags: DSCAPS_INTERLACED, DSCAPS_SEPARATED
  or DSCAPS_PREMULTIPLIED.
- Added DLCAPS_SCREEN_POSITION and DLCAPS_SCREEN_SIZE.
  These are set if DLCAPS_SCREEN_LOCATION is set and vice versa.
  Unscalable layers just have DLCAPS_SCREEN_POSITION.
- Added DSECAPS_BRIGHTNESS, DSECAPS_CONTRAST, DSECAPS_HUE, DSECAPS_SATURATION.
- Added DSECONF_ADJUSTMENT to DFBScreenEncoderConfigFlags.
- Added 'DFBColorAdjustment adjustment' to DFBScreenEncoderConfig.