Hexagon: updated software/libraries

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Hexagon has updated software and libraries.

xt-mpich2 5.4.5
Cray compiler cce 8.0.4
papi 4.3.0.1
PGI 12.3.0
GCC 4.6.3
lgdb 1.5
PETSc 3.2.01
xt-asyncpe 5.09
perftools 5.3.2

See

http://docs.cray.com/books/S-9401-1204//S-9401-1204.pdf

for full changelog.