use this for parameters

not strictly necessary, but we might as well.

cpp/full_code/NSVE.cpp

@@ -64,11 +64,11 @@ int NSVE<rnumber>::initialize(void)
     }
     this->fs = new vorticity_equation<rnumber, FFTW>(
             simname.c_str(),
-            nx, ny, nz,
-            dkx, dky, dkz,
+            this->nx, this->ny, this->nz,
+            this->dkx, this->dky, this->dkz,
             fftw_planner_string_to_flag[this->fftw_plan_rigor]);
     this->tmp_vec_field = new field<rnumber, FFTW, THREE>(
-            nx, ny, nz,
+            this->nx, this->ny, this->nz,
             this->comm,
             fftw_planner_string_to_flag[this->fftw_plan_rigor]);