Move flag handling from CamelMimeMessage to CamelFolder. This

	simplifies several flag-handling pieces of code in the mailer, and
	lets you change a message's flags without having to fetch the
	message body. It also means that fully-constructed
	CamelMimeMessages are now essentially constant, which will help
	simplify locking issues later since it means two threads
	interested in the same message can just work with separate copies
	of it.

	* camel-mime-message.h (struct _CamelMimeMessage): Removed flags
	and user_flags (moved to summary). Removed expunged and
	message_number which were unused. Removed message_uid and folder
	which are no longer needed in the new scheme.
	(struct CamelMimeMessageClass): Removed message_changed signal and
	get/set_message_number methods.

	* camel-mime-message.c: Updates for CamelMimeMessage changes.
	(camel_mime_message_get/set_flags,
	camel_mime_message_get/set_user_flag): Replaced with methods in
	CamelFolder.
	(camel_flag_get, camel_flag_set, camel_flag_list_size,
	camel_flag_list_free): Moved verbatim to camel-folder-summary.c

	* camel-folder.c (camel_folder_get/set_message_flags,
	camel_folder_get/set_message_user_flag): New methods (and
	corresponding useless default implementations)
	(camel_folder_class_init): add a message_changed signal

	* camel-folder-summary.c (camel_flag_get, camel_flag_set,
	camel_flag_list_size, camel_flag_list_free): Moved here from
	camel-mime-message.c

	* providers/mbox/camel-mbox-folder.c (message_changed): Removed.
	(mbox_get_message_flags, mbox_set_message_flags,
	mbox_get_message_user_flag, mbox_set_message_user_flag): Tweak
	summary bits as appropriate. (Functionality moved here from
	message_changed.)
	(mbox_get_message_by_uid): Update for CamelMimeMessage changes
	(less stuff to initialize).

	* providers/imap/camel-imap-folder.c (message_changed): Remove
	this. It was just copied from the mbox provider and doesn't deal
	with the real IMAP flag stuff anyway. (So there's currently no
	flag support in the IMAP provider.)
	(imap_get_message_by_uid): Update for CamelMimeMessage changes.

	* providers/vee/camel-vee-folder.c: (message_changed): Remove old
	one. Add a new one to listen for message_changed on each folder
	and re-emit message_changed signals that correspond to messages in
	the vfolder.
	(vee_get/set_message_flags, vee_get/set_message_user_flag): Proxy
	flag setting to the underlying real messages.
	(vee_append_message): Removed for now; there's no way to translate
	this into the new CamelMimeMessage/CamelFolder scheme, but (a)
	there's also no code which would ever call it and (b) we're
	probably going want a better interface than append_message for
	message drag and drop to work anyway. To be revisited.

svn path=/trunk/; revision=3598

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