Removed dependence on custom StringTools. \n
Replaced by boost library components dependence
In all MPI_Bcast type of nbSteps is sent as MPI_UNSIGNED_LONG.
Caused failures when mixed MPI_INT and MPI_UNSIGNED_LONG.
boost::filesystem::copy replaced by boost::filesystem::copy_file with
boost::filesystem::copy_option::overwrite_if_exists argument to avoid exception
if cfg file with with this name exists.