modified the spacing of the statusbar of address book.
fixed crash bug when an address in a group was modified. Fixed memory leaks.
made the order of buttons comply with GNOME HIG.
fixed Turkish locale problem.
reimplemented summary view with GtkTreeView.
replaced intl.h with glib/gi18n.h.
use GTK stock button for button set.
Initial import of Sylpheed (GTK2 version).