update optimization solvers for SolverMeta, new ._parameters class atribute
update optimization solvers for SolverMeta, new ._parameters class atribute

- update FMinSteepestDescent, ScipyFMinSolver - remove .process_conf()

rc/sfepy,sfepy/sfepy,rc/sfepy,lokik/sfepy,vlukes/sfepy,lokik/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,rc/sfepy,BubuLK/sfepy,vlukes/sfepy,BubuLK/sfepy,lokik/sfepy,lokik/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy,sfepy/sfepy,vlukes/sfepy,sfepy/sfepy