Hexagon: Updated software/libraries

Hexagon has updated software and libraries.

For full release notes from Cray, look at:

http://docs.cray.com/books/S-9401-1107//S-9401-1107.pdf

Note that some of the software listed there is not supported/will not be installed on hexagon.

Updates:

xt-mpt 5.3.0 -> 5.3.0

Petsc 3.1.05 -> 3.1.08
TPSL 1.0.01 -> 1.1.00
libfast 1.0.8 -> 1.0.9

ATP 1.2.0 -> 1.2.1
lgdb 1.3 -> 1.4

(xt-)gcc 4.5.3 -> 4.6.0
PGI 11.5.0 -> 11.6.0
xt-asyncpe 4.9 -> 5.00