Changes for 42.2

- graphics/BitmapScale() did not work properly for 24bit 3BPP CyberGraphX 
  maps (e.g. corrupt graphics with Voyager 2.x/3.x on 24bit packed pixel
  screens)
- added additional parameter clipping to graphics/GetRGB32() patch to 
  avoid memory trashing problems when invalid parameters were used for
  the starting colour or the colour count
- added an additional WaitBlit() after chip->chip bitblits to avoid problems
  with slow amiga blitter
- fixed a "crawling ants" problem in the line drawing code if someone tried
  to draw a patterned line with only one pixel length
- For doublescan screens the vertical mouse resolution is halfed which should
  half vertical mouse speed, too
- A datatypes.library >= v44 is not patched by CyberGraphX anymore
- CyberGraphX's OpenScreenTagList() patch now passes the SA_Pens tag
  to intuition even if a workbench type screen is to be opened. This
  fixes the problem that ScalOs assigned system pens were ignored before.
- fixed a bug in graphics/BltMaskBitMapRastPort() patch which caused this
  function not to work properly when the source bitmap was relocated to 
  graphics board video memory. This should fix the transparent NewIcons 
  rendering bug in conjunction with the BITMAPCACHE option in Scalos.
- BltBitmap[RastPort]() & ClipBlit() with minterm 0x6x (src EOR dst) now really 
  do a src EOR dst operation instead of swapping src and dst bits on extended 
  chunky maps. This fixes some problems with Iconian's popup gadgets on 
  high/truecolour screens for example
- added new environment variable FORCECHUNKY to disable/enable 
  graphics/AllocBitmap() BMF_MINPLANES flag compatibility kludge (was required
  by applications like old picture/animation.datatype which relied on 
  AllocBitmap() returning planar bitmaps even when a friend bitmap was passed).
  This switch defaults to off.

Changes for 42.1

- cybergraphics vblank interrupt handler is now only installed if at least
  one graphics card is configured for draggable screens
- fixed some problems with doublebuffered screen bitmaps

Changes for 42.0

- initial v4 release