changed AquaSalGraphics implementation

Hi,

attached you'll find a changed implementation for
AquaSalGraphics. This 
implements the new way of only painting to a back buffer and
only 
updating to the window if a system event requests it (or the
frame is 
flushed).

I found no more problems in comparison to the aquavcl01
checked in 
version and an outdevgrind test (vcl's performance measuring
tool to be 
found in vcl/workben) shows that performance almost over the
board is 
considerably better. However since it's a quite invasive
patch I'd like 
people to play with it and find severe problems before I
commit it.

Unless someone objects until tomorrow evening (german time)
I'll commit 
this patch.

Kind regards, pl

-- 
If you give someone a program, you will frustrate them for a
day;
if you teach them how to program, you will frustrate them
for a lifetime.
      -- Author unknown


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