[pstricks] psRandom (PSTricks-add command) and Beamer overlays

[Christian Häger]

> A rather small change in the \psRandom at iii definition would allow to set a fixed seed or not (with a new parameter randomSeed).
> randomSeed=0 retains the current behaviour, using any other integer fixes the seed: [...]

Perfect! Works as advertised. Thank you very much! Plus you don't loose the old behavior in case you need it. 

> Christoph
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