Added functionality to throw error when time step changes and PLUMED is being used

src/USER-PLUMED/fix_plumed.cpp

@@ -446,6 +446,11 @@ void FixPlumed::min_post_force(int vflag)
   post_force(vflag);
 }
 
+void FixPlumed::reset_dt()
+{
+  error->all(FLERR,"cannot reset_dt within a fix plumed action"); 
+}
+
 double FixPlumed::compute_scalar()
 {
   return bias;

src/USER-PLUMED/fix_plumed.h

@@ -41,6 +41,7 @@ class FixPlumed : public Fix {
   void post_force_respa(int, int, int);
   void min_post_force(int);
   double compute_scalar();
+  void reset_dt();
 
  private: