partially adding boxrelax

src/min.h

@@ -58,13 +58,17 @@ class Min : protected Pointers {
   double dmax;                // max dist to move any atom in one step
   int linestyle;              // 0 = backtrack, 1 = quadratic, 2 = forcezero
 
-  // only for min_adaptglok
+  // only for minimize style adaptglok
   int delaystep;              // minium steps of dynamics
   double dtgrow,dtshrink;     // timestep increase, decrease 
   double alpha0,alphashrink;  // mixing velocities+forces coefficient
   double tmax,tmin;           // timestep multiplicators max, min
   int integrator;             // Newton integration: euler, leapfrog, verlet...
   int halfstepback_flag;      // half step backward when v.f <= 0.0
+  double relaxbox_modulus;    // Bulk modulus used for box relax
+  double relaxbox_rate;       // for box relaxation to 0 pressure
+  int relaxbox_flag;          // 1: box relaxation iso; 2: axial
+  double ptol;                // pressure threshold for boxrelax
 
   int nelist_global,nelist_atom;    // # of PE,virial computes to check
   int nvlist_global,nvlist_atom;