Now Chapel will use by default in ibv networks the large segment, as there are problems when using the everything and fast segments with ibv.
Now Chapel will use by default in ibv networks the large segment, as
there are problems when using the everything and fast segments with ibv.

The default segment can be changed by defining the CHPL_GASNET_SEGMENT
environment variable, in case it is needed.

Reviewed by Brad


git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@22745 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

hildeth/chapel,CoryMcCartan/chapel,hildeth/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,hildeth/chapel,CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,sungeunchoi/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,chizarlicious/chapel,CoryMcCartan/chapel,hildeth/chapel,CoryMcCartan/chapel,chizarlicious/chapel,chizarlicious/chapel,sungeunchoi/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,sungeunchoi/chapel