Merge branch 'develop' into 'main'

Add init PD

See merge request !4

src/structure.cpp

@@ -4,7 +4,9 @@
 #include <stdexcept>
 #include <cmath>
 
-Structure::Structure() {}
+Structure::Structure() {
+  PeriodicTable::initialize();
+}
 
 const Atom &Structure::operator()(const size_t i) const{
   return atoms[i];

src/structure_db.cpp

@@ -2,8 +2,11 @@
 #include <tadah/core/periodic_table.h>
 #include <cstdio>
 
-StructureDB::StructureDB() {}
+StructureDB::StructureDB() {
+  PeriodicTable::initialize();
+}
 StructureDB::StructureDB(Config &config) {
+  PeriodicTable::initialize();
   add(config);
 }