Revision V40.49 (changes since 40.47)
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   - changed the way ReadPixel() works on non clut screens.
     MatchPenColour now scans palette in reverse order in order
     to fix some problems.
   - CygnusED EOF marker is now shown correctly
   - pctask text modes now show up correctly under cybergraphics
     (inverse text before)
   - fixed jam2 line pattern bugs
   - fixed "pointer gets square" bug when screen was dragged down
     too far. Some machines even crashed ......

   (- added faster text output ) <- disabled in 40.49 (to be revised)