src/libvtemm/g/terminal.(h|cc)g:
	1. wrap commit signal by hand, when it will be possible.
	("char, int" -> ("std::string"|"Glib::ustring"))
	2. remove nonconst getter functions, when it will be possible.
src/libvtemm/textandcharattrs.(h|cc):
	1. remove nonconst getter functions, when it will be possible.
src/libvtemm/g/*.(h|cc)g:
src/libvtemm/*.(cc|h):
	1. squashing bugs. as always.
