Add set_nstep_max function to LineMinimizer

src/LineMinimizer.C

@@ -189,7 +189,7 @@ double LineMinimizer::next_alpha(double alpha, double f, double fp)
   {
     // we are already in bracketing mode
     nstep_++;
-    if ( nstep_ > nstep_max_ )
+    if ( nstep_max_ > 0 && nstep_ > nstep_max_ )
     {
       if ( debug_print )
         cout << "LineMinimizer: fail, nstep_max" << endl;

src/LineMinimizer.h

@@ -53,6 +53,7 @@ class LineMinimizer
   void set_sigma2(double s) { sigma2_ = s; }
   void set_alpha_start(double a) { alpha_start_ = a; }
   void set_alpha_max(double a) { alpha_max_ = a; }
+  void set_nstep_max(int n) { nstep_max_ = n; }
   void set_debug_print(void) { debug_print = true; }
 
   double next_alpha(double alpha, double f, double fp);