Q3GUI/RplParamDlgWidgets.ui
  QCheckBox* _ui->_databaseUnitsCheckBox;

Q3GUI/RplParamDlg.hpp/.cpp:
  void databaseUnitsHandler(bool);

RplExpression/NumericValue.hpp/.cpp:
  static bool usingDatabaseUnits();
  static void setUseDatabaseUnits(bool useDatabaseUnits);
  static bool _useDatabaseUnits;

Used in method:
  QString NumericValue::formatValue(
    int precision, Format format, bool forDisplay) const;