up macport Portfile :
 - petsc 3.4.4 and add variant +pastix
 - gmsh-devel 2.8.5 + fix slepc variant
up portfile to gcc48
up openmpi portfile to gcc48
up
fix slepc portfile
use gcc48
add patch for gmsh-devel portfile : not take the libANN on system + slepc also as defaut variant