* src/widgets/modest-combo-box.[ch]:

        * Added (modest_combo_box_set_pair_list), to be able to set
          the pair list after constructing the widget.
* src/widgets/modest-window-mgr.[ch]:
        * Added a new cache for preconstructing message view and editor
          so that we can speed up opening messages. We provide methods
          ..._get_msg_view_window and ..._get_msg_edit_window. The
          cached instances are constructed in the idle loop. These
          methods are used internally in constructors of editor and
          view.
* src/maemo/modest-msg-edit-window.c:
        * Completely new structure of the widget construction. Now it
          happens in two stages. First stage is in init_window. Here it
          constructs as much as possible the widget without any specific
          running parameter. Then the ..._new constructor connects all
          signals, configures the widget with ModestConf and sets the
          message. This way, we can precreate the widget in the window
          manager cache.
        * Modified menubar_to_menu to ask for the popup menu in xml
          instead of the old hack of reparenting children of menubar.
* src/maemo/modest-msg-view-window.c:
        * Similar refactoring to the one in editor. Now init creates all
          the widgets, and they're finally set up in construction. We
          also use the window manager cache.
        * Similar change to menubar_to_menu.
* src/maemo/ui/modest-msg-view-window-ui.xml,
  src/maemo/ui/modest-msg-edit-window-ui.xml:
        * Instead of a <menubar> I changed it to be a <popup> to get
          a GtkMenu instead of a GtkMenubar
* src/modest-widget-memory.c:
        * Cleaned a small leak.

pmo-trunk-r3738