1. use older gcc instead of 4.9.1 2. add ITK thread control for N4Bias ANTs and NLM
1. use older gcc instead of 4.9.1
2. add ITK thread control for N4Bias ANTs and NLM

dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim,dawnsong/spf13-vim