[galib] MultiThread + Functor

[Guillaume Massé]

Hi all galibers,

I'm doing a modification of the galib that could be really useful for a new
release.

First I wanted to re-implement population evaluation in a multithread way.
So i added the code to do so. But i realize quickly that this imply other
modification in the lib.

The evaluation function pointer is stored in a member of GAGenome called
Evaluator. Thus two thread could call that function at the same time
competing for any static memory. In my case it was even worst, the objective
function was implemented as a functor.

So to solve this problem I will implement a Evaluator base class. It will
have to implement operator()( GAGenome& g) and operator= to make copy. This
way each Genome of a Population will have is own Evaluator.

Guillaume Massé
École Polytechnique de Montréal
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