Fixed some problems with synchronization between the attachments in
the attachments view of the editor, and the internal attachments list
the editor contains (fixes NB#57756):
* src/widgets/modest-attachments-view.[ch]:
* Added the method modest_attachments_view_get_attachments, that
obtains the mime parts of all the attachments shown.
* src/maemo/modest-msg-edit-window.c:
* Now, set_msg updates the list of attachments from the
attachments view.
* Fixed the code to hide and show the attachments caption.
pmo-trunk-r2095