@feelpp/feelpp disable logging from command line
 - --no_log=0 enable logging for all mpi processes
 - --no_log=1 enable logging only for rank 0 process
 - --lo_log=2 disable logging for all processes

by default no_log is set to 1, so only rank 0 process writes to disk
fix issue #182,
gflags and glog are now shipped with Feel++, this is a modified version of both gflags and glog to fit feel++ needs