Support optional grid configuration string in colvar_grid_scalar

Author: giacomofiorin

src/colvargrid.cpp

@@ -133,8 +133,9 @@ colvar_grid_scalar::colvar_grid_scalar(colvar_grid_scalar const &g)
 
 colvar_grid_scalar::colvar_grid_scalar(std::vector<colvar *> &colvars,
                                        std::shared_ptr<const colvar_grid_params> params,
-                                       bool add_extra_bin)
-  : colvar_grid<cvm::real>(colvars, 0.0, 1, add_extra_bin, params), samples(NULL)
+                                       bool add_extra_bin,
+                                       std::string config)
+  : colvar_grid<cvm::real>(colvars, 0.0, 1, add_extra_bin, params, config), samples(NULL)
 {
 }
 

src/colvargrid.h

@@ -1294,7 +1294,8 @@ class colvar_grid_scalar : public colvar_grid<cvm::real>
   /// Constructor from a vector of colvars
   colvar_grid_scalar(std::vector<colvar *> &colvars,
                      std::shared_ptr<const colvar_grid_params> params = nullptr,
-                     bool add_extra_bin = false);
+                     bool add_extra_bin = false,
+                     std::string config = std::string());
 
   /// Accumulate the value
   inline void acc_value(std::vector<int> const &ix,