add new option -ncpu to root-config.
add new option -ncpu to root-config.

--ncpu reports the number of (hyperhtreaded) cores in a machine independent way.

tc3t/qoot,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot,tc3t/qoot,kirbyherm/root-r-tools,kirbyherm/root-r-tools,kirbyherm/root-r-tools,tc3t/qoot,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot,tc3t/qoot,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot,kirbyherm/root-r-tools