data type mismatch 

Hi, 

the variable `nstages` is an integer, but you are passing `MPI_DOUBLE_PRECISION` to the MPI call in `fortress_smc_t.f90`:

```
       call mpi_bcast(self%temp%nstages, 1, MPI_DOUBLE_PRECISION, &
            0, MPI_COMM_WORLD, mpierror)
```
This is clearly a bug. 