Add a "char **appended_uid" argument, for the caller to optionally pass in

Add a "char **appended_uid" argument, for the caller to optionally pass in

	* camel-folder.c (camel_folder_append_message): Add a "char
	**appended_uid" argument, for the caller to optionally pass in a
	variable to receive the UID of the appended message (if the
	provider knows it).
	(camel_folder_transfer_messages_to): Likewise, add "GPtrArray
	**transferred_uids"
	(transfer_messages_to): Update default implementation to handle
	transferred_uids.

	* camel-disco-folder.c (disco_append_message,
	disco_transfer_messages_to): Update for API changes.

	* camel-disco-diary.c (camel_disco_diary_replay): Update the
	diary's temporary uid->real uid map when replaying appends and
	transfers.

	* providers/imap/camel-imap-folder.c (imap_append_offline,
	imap_append_online, imap_transfer_offline): Pass back the new
	UIDs, when requested and available.
	(imap_append_resyncing): Pass back the new UIDs when requested and
	available. Remove the diary uidmap managing code since
	CamelDiscoDiary can handle that itself now.
	(imap_transfer_online, imap_transfer_resyncing): Update for new
	APIs, but don't actually pass back the new UIDs yet. (It's tricky
	since the COPYUID response may not be in the same order as the
	input uids.)

	* providers/local/camel-maildir-folder.c (maildir_append_message):
	Pass back the new UID if requested.

	* providers/local/camel-mbox-folder.c (mbox_append_message):
	Likewise.

	* providers/local/camel-mh-folder.c (mh_append_message): Likewise.

	* providers/local/camel-spool-folder.c (spool_append_message):
	Likewise.

	* camel-digest-folder.c (digest_append_message,
	digest_transfer_messages_to): Update for API changes.

	* camel-filter-driver.c	(camel_filter_driver_filter_message,
	do_copy, do_move): Update for API changes.

	* camel-vee-folder.c (vee_append_message,
	vee_transfer_messages_to): Likewise.

	* camel-vtrash-folder.c (vtrash_append_message,
	vtrash_transfer_messages_to): Likewise.