Upgrade Code_Aster to 12.0.6-4.
This brings french/eficas to 2016.0.1,
cad/astk-serveur and astk-client to 1.13.8.2,
french/med to 3.2.0 (built against hdf5-18),
bump PORTREVSION to math/metis-edf and fix soname,
and french/homard to 11.7-1.