Cleanup of the timeout and Fl::wait() code. This one calls the clock

function less than half as much, which resulted in a noticable
improvement in a flip book program I was working on.  The code looks
nicer, too, and I am reasonably certain it works the same.

Fl::wait(time) with a time greater than the system can handle (24.855
days on NT, the same on some Unix systems) will now act as though the
time is infinity.  Before it would do unpredictable things.

"USE_POLL" now compiles and works, although it is disabled by default.
poll() is an alternative to the Unix select() call which is available on
Linux and Irix, but I don't know if it is faster, you can try it by
editing config.h.

I tried making the NT USE_ASYNC_SELECT code do translate/dispatch of
the select events on the assumption (based on experience) that not
doing this to every event gives NT fits.  This appears to work but I'm
not sure if it fixes anything.

X version does not crash if Fl::wait() is called when the display is
closed (it will not return unless you have a timeout or fd callback
set up, though).

Fixed up the documentation for all of this, including getting rid of
some completely misleading documentation.

Now I need to get this stuff into 2.0...


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.0@1215 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

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