Remove option relaxbox from adaptglok: wrong behavior with non-P boundaries. Code cleanup.

src/min.h

@@ -69,12 +69,6 @@ class Min : protected Pointers {
   int halfstepback_flag;      // half step backward when v.f <= 0.0
   int delaystep_start_flag;   // delay the initial dt_shrink
   int max_vdotf_negatif;      // maximum iteration with v.f > 0.0
-  double relaxbox_mod;        // Bulk modulus used for box relax
-  double relaxbox_rate;       // for box relaxation to 0 pressure
-  int relaxbox_flag;          // 1: box relaxation iso; 2: aniso
-  double ptol;                // pressure threshold for boxrelax
-  int p_flag[3];
-  int dimension;
 
   int nelist_global,nelist_atom;    // # of PE,virial computes to check
   int nvlist_global,nvlist_atom;