Hexagon: updated software/libraries

Hexagon has updated software/libraries.

NOTE: a module has been renamed from xtpe-interlagos to craype-interlagos, if you call the module yourself please update your scripts/config.

A symlink is provided in the transition.

Please see the following for full information:

http://docs.cray.com/books/S-9407-1305//S-9407-1305.pdf

cray-mpich2 5.6.4 -> 5.6.5

PGI 13.3.0 -> 13.4.0
CCE 8.1.7 -> 8.1.8
gcc 4.7.2 -> 4.7.3
xt-asyncpe 5.19 -> 5.20

cray-libsci 12.0.01 -> 12.0.02
cray-tpsl 1.3.02 -> 1.3.03
cray-ga 5.1.0 -> 5.1.0.1
cray-trilinos 11.0.3.0 -> 11.0.3.1
cray-petsc 3.3.04 -> 3.3.05