Nits. Fix a typo for the fmm program in splash2-standard.cfg, and added instructions on how to solve the GLIBCXX_3.4.15 not found issue for parsec and npb.
Nits. Fix a typo for the fmm program in splash2-standard.cfg, and added instructions on how to solve the GLIBCXX_3.4.15 not found issue for parsec and npb.

hemingcui/xtern_with_paxos,columbia/xtern,columbia/xtern,hemingcui/xtern_with_paxos,columbia/xtern,columbia/xtern,columbia/xtern,hemingcui/xtern_with_paxos,hemingcui/xtern_with_paxos,hemingcui/xtern_with_paxos,columbia/xtern