import from gsl zsolve_cubic.c which contains a bug fix patch to avoid NaN in case of small degenerate roots (this has been found thanks to https://savannah.cern.ch/bugs/?49031)  bug has been submitted in GSL too. When GSL will release this bug, fix this file can be removed
import from gsl zsolve_cubic.c which contains a bug fix patch to avoid NaN in case of small degenerate roots
(this has been found thanks to https://savannah.cern.ch/bugs/?49031)
 bug has been submitted in GSL too. When GSL will release this bug, fix this file can be removed


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@28377 27541ba8-7e3a-0410-8455-c3a389f83636

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