up Portfile openmpi to version 1.6.5 and fix variant gcc47 (also fix slepc Portfile)
up Portfile petsc to version 3.4.3 and use +atlas +ml as default variant (ps : accelerate not work with slepc)
up Portfile slepc to version 3.4.3
up Portfile gmsh-devel : not depends to petsc if has not variant slepc