QGAL (QSimplex): Add constraints simplification

Now the simplex solver is able to remove fixed variables from its
constraints as to improve its running time.

The simplification consists of two actions that are done iteratively
until no possible changes exist:

 1st) Look for constraints of type Var == Constant
      Save constant as the trivial value of Var
 2nd) Substitute known results in existing constraints

Signed-off-by: Eduardo M. Fleury <eduardo.fleury@openbossa.org>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@openbossa.org>

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