Issue #2201783 by sun: Simplify execution logic in TestBase::run().
Issue #2208793 by salvis: Notice: Undefined variable: label_element in form_process_table().
Issue #2208669 by andrei.dincu | Berdir: Remove book_library_info().
Issue #2194897 by sun: Rename Database\Query\Merge::key() to keys(), retain a BC alias for key().