Added str def for polarity pattern

Author: Arthur Glowacki

src/data_struct/params_override.h

@@ -93,6 +93,7 @@ class DLL_EXPORT Params_Override
         ge_dead_layer = "0.0";
         airpath = "0";
         theta_pv = "";
+        polarity_pattern = "";
     }
 
     Params_Override(std::string dir, int detector)
@@ -116,6 +117,7 @@ class DLL_EXPORT Params_Override
         dataset_directory = dir;
         detector_num = detector;
         detector_element = "Si";
+        polarity_pattern = "";
     }
 
     ~Params_Override()
@@ -245,6 +247,8 @@ class DLL_EXPORT Params_Override
     T_real ds_amp_sens_num;
     std::string ds_amp_sens_unit;
 
+    std::string polarity_pattern;
+
 };
 
 TEMPLATE_CLASS_DLL_EXPORT Params_Override<float>;

src/data_struct/scan_info.h

@@ -92,6 +92,7 @@ struct Scan_Meta_Info
     std::string name;
     std::string scan_time_stamp;
     std::string scan_type;
+    std::string polarity_pattern;
     ArrayTr<T_real> x_axis;
     ArrayTr<T_real> y_axis;
     int requested_cols;