Added slurm queue system support with gasnet.
It is documented in docs/release/README.launcher


git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@21908 3a8e244f-b0f2-452b-bcba-4c88e055c3ca
Section with slurm launcher notes added.


git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@21909 3a8e244f-b0f2-452b-bcba-4c88e055c3ca
Added to the launcher list the new one for slurm:
slurm-gasnetrun_ibv

and have put the needed environment variables to define before using
slurm


git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@21910 3a8e244f-b0f2-452b-bcba-4c88e055c3ca