show translated messages on the statusbar. Prohibit addressbook names begin with '@'.
removed all warnings output with -Wall.
editbook.c: win32: fixed a bug that the name entry didn't accept key input.
use 'Address Book' instead of 'Addressbook'.
modified the spacing of the statusbar of address book.
made the order of buttons comply with GNOME HIG.
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).