random number generators for calc

[tino]

> > just happened to reimplement RAND() with a B.A Wichmann
> > and I.D Hill generator.. see
> 
> 	As they are entitled to. No doubt we'll come up with a comprehensive,
> nicely architected and beautiful solution of our own :-)

Ok, I'll go ahead with a suggestion then. :)

Attached patch is just a simple wrapper around boost, to be used like

sc::rng::seed() to replace libc srand()
sc::rng::rand() to replace libc rand()

and a few more distributions.

I've also modified ScInterpreter::ScRandom()
to simply call sc::rng::uniform()
which should solve bug 33365.

I've not modified RANDBETWEEN(a,b) yet but this could simply call
sc::rng::uniform_int(a,b).

Also, the rand in Basic could be changed in the future.

Small problems:
 - compiler warnings from within boost
 - few asserts might need to be replaced

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