todo
----
i002: message view and message edit window should know what account they apply to;
      thus, the 'From:' information and TransportAccount can be decided
i003: when creating a new message, the information should be set according to i002
i004: message windows should get all the icons/toolbars/menus
i005: all available menu items / toolbar items  should have accompanying
      actions, or be removed
i006: make UI (folder, header view) update automatically when there is a change (update,
      delete, move, etc.)
i007: make connecting to server async and  cancellable, progress shown
i008: make sending message async and cancellable, progress shown
i009: implement the send queue stuff; different queues for different
      transports, but one outbox shown in ui. (use symlinks?)
i010: make the modest manpage
i011: make the modest webpage
i012: use the platform icons (don't ship icons unless not provided by platform)
i013: maemo: make tnymaemodevice track online/offline correctly
i014: maemo: make all the platform integration stuff work (icons, .desktop, .service)
i015: add 'edit' support to the account editor
i017: port account setup / editor to maemo
i018: make d&d work


done
----
i016:: add 'make default' to the account editor
i001: add a message view window; it's quite different from the edit view,
      as it is readonly, and will use the html-view instead of text-view

later
-----
- automatically save new msgs to draft when changed, ask when closing
- remember 'last updated' per-account
- attachment support
- dbus support
- backup support
- specific account for certain transport (TnyMaemoDevice)
- only one account (+ local folders) visible at a time (maemo frontend)


additional reqs
---------------
r001: should compile with -Wall -Werror
r002: any remaining valgrind errors understood
r003: all public functions documented
r004: no segfaults
r005: understand the limitations/bugs, so we can mention them
r006: handle errors in all cases
r007: track tinymail changes
r008: track tinymail bugs, and report them