Changing GASNET_MAX_SEGSIZE from subtracting 1/2 GB to 90% of /proc/meminfo
Changing GASNET_MAX_SEGSIZE from subtracting 1/2 GB to 90% of /proc/meminfo

Based on feedback from Tim Stitt -- on his 16GB nodes he had to
subtract off more than 1/2 GB for some reason...



git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@15439 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

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