Hexagon: updated software/libraries

Hexagon has updated software/libraries.

Full information will soon be at http://docs.cray.com/relnotes/


Updates:
cray-mpich 6.0.0 -> 6.0.1
xt-asyncpe 5.21 ->5.22
gcc 4.8.0 -> 4.8.1
cray-libsci 12.1.00 -> 12.1.01
intel compiler 13.1.1.163 -> 13.1.3.192