Implemented tetengo2::gui::widget::custom_control.
Corrected Doxygen comments.
Corrected a Doxygen comment.
Modified precompiled.h.
Modified stdlib_headers.txt.
Corrected #includes.
Implemented test_tetengo2::gui::widget::custom_control.
Added a TODO item.
Corrected a compilation error.
Corrected Makefile.ams.
Corrected Makefile.am.