Hexagon: updated software/libraries

Hexagon has updated software/libraries.

Please see the following for full information about fixes and limitations:

http://docs.cray.com/books/S-9407-1304//S-9407-1304.pdf

Some of this information is also in the output of "module help modulename"

MPI/MPT:
cray-mpich2 5.6.3 -> 5.6.4

Compilers:
Cray (cce): 8.1.6 -> 8.1.7
Chapel: 1.6.0 -> 1.7.0
Intel: 13.1.0.146 -> 13.1.1.163
PGI: 12.10.0 -> 13.3.0

Debug:
cray-lgdb: 2.0.2 -> 2.0.3
stat: 2.0.0