[new] devel/med

Please find attached a port for devel/med. This port is required by
cad/freecad, a port I intend to submit once it's dependencies have been
comitted.

COMMENT:
library for reading and writing MED files

DESCR:
MED-fichier (Modélisation et Echanges de Données, in English
Modelisation and Data Exchange) is a library to store and exchange
meshed data or computation results. It uses the HDF5 file format
to store the data.

All tests are passing.

Feedback? OK's? Thank you.