* Added new store actions: create/remove/rename/delete folder

* Added new store actions: create/remove/rename/delete folder

* Added two new account keys, forward_type, reply_type

* src/gtk/modest-edit-msg-window.c: the From field is now selected
from the combo selection

* src/gtk/main-window.c: added reply/forward support through
ModestConf. Updated to the new MailOperation API. Added a method to
handle presses on to the delete button

* src/widgets/modest-msg-view.c
* src/modest-mail-operation.c: updated to the new TnyMimePart API

* src/modest-widget-factory.c: added a new handler for key presses
over the folder view. Updated to the new TnyGtkAccountTreeModel API.

* src/widgets/modest-combo-box.c: added the inheritance from
GtkComboBox. Added a new function to get the active display name. Some
refactorings.

* src/widgets/modest-folder-view: added/removed some members of the
priv structure. Added get_selected_account method. Added handler for
subscription_changed signal. Some other utility functions added.

* src/modest-tny-msg-actions.c: added modest_tny_msg_actions_copy,
modest_tny_msg_actions_move methods to transfer messages. Added
modest_tny_msg_actions_remove to remove messages

pmo-trunk-r486