Little bug in Tabular::Write

Hello, As I thought the original code by Juergen was also wrong it should be as follows (I do the diff by hand, sorry): os "Features" write_attribute("rotate", rotate) write_attribute("islongtable", is_long_tabular) write_attribute("endhead", endhead)

Little bug in Tabular::Write

Hello, As I thought the original code by Juergen was also wrong it should be as follows (I do the diff by hand, sorry): os << "