revert some things, my mental health is at an all time low

src/MD-original.cpp

@@ -540,7 +540,7 @@ void computeAccelerations() {
 }
 
 // returns sum of dv/dt*m/A (aka Pressure) from elastic collisions with walls
-double VelocityVerlet(double dt, int iter, double *PE, FILE *fp) {
+double VelocityVerlet(double dt, int iter, FILE *fp) {
   int i, j, k;
 
   double psum = 0.;