GmshOption "Reset" to reset db + PViews + previous GModels

Fltk/onelabGroup.cpp

@@ -1314,6 +1314,15 @@ static void setGmshOption(T &n)
     FlGui::instance()->rebuildTree(false);
     return;
   }
+  if(opt == "Reset"){ // reset db + models except current one
+    resetDb(false);
+    for(int i = PView::list.size() - 1; i >= 0; i--)
+      delete PView::list[i];
+    for(int i = GModel::list.size() - 1; i >= 0; i--)
+      if(GModel::list[i] != GModel::current()) delete GModel::list[i];
+    FlGui::instance()->rebuildTree(false);
+    return;
+  }
   std::string::size_type dot = opt.find('.');
   if(dot == std::string::npos) return;
   GmshSetOption(opt.substr(0, dot), opt.substr(dot + 1), n.getValue());