window is a bin

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m + add GContainer

Signed-off-by: Mattias Andrée <maandree@operamail.com>
GtkPaned, GtkVPaned and GtkHPaned

Signed-off-by: Mattias Andrée <maandree@operamail.com>