Changes:
Version 1.1
* The intensity of rain and storm is configurable now. New options:
-rain <0-10> and -storm <0-10> (the old yes-or-no variants are deprecated).
* The viscosity of the fluid is no longer a constant (without any speed
loss). New option: -viscosity <1-5>
* The rain feature no longer prevents from the idle mode: just obscure by
other windows, but don't give -nww.
* Bugfix: On 64-bit x86, xdesktopwaves now even compiles with gcc 3.4.
* Bugfix: Fixed arithmetic exception on systems with a small RAND_MAX.
* Bugfix: If -stippled, clear window at initialization.
* Optimization/Bugfix: The color palette is reduced to have only different
colors. This can spare about 10% of the rectangles sent to the server,
if the display depth is 16-bit.
* Optimization: Treatment of minimum range of out-of-date canvas rows. This
spares up to 50% client CPU cycles when there are just very few waves
(shortly before entering idle mode).
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