After having been away from home for a week, I'm back now and I'm working on
my particle system again.

I have made linear interpolation of the particle locations, which means that
the particles now move smoothly also when the calculation frame-rate is not
a multiple of the render frame-rate. For example this animations has a
render frame-rate of 30 frames per clock-unit and a calculation frame-rate
of 20 frames per clock-unit.

This is an advantage for example if you have set up a particle system that
behaves perfectly in your test renders. For your final render you want a
higher render frame-rate but you want the particle system to behave exactly
the same, so you don't change the calculation frame-rate. The particles will
still move smoothly because of the interpolation.

I have also changed this preview animation mainly by using many more
particles, by making the blob elements more blobby and of course by
rendering at a higher resolution.

As always, comments appreciated!

Rune
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