available). Deal with servers that don't return LIST flags in
	response to LSUB (like UW) to get rid of the "not a selectable
	folder" error messages in the UI. Take advantage of the \Marked
	and \Unmarked flags to try to speed up the folder scan by not
	doing STATUS on unmarked folders. Some further tweaks on the shape
	of the resulting folder tree in various situations...

	* camel-store.h: Remove the (read) message_count, since nothing
	uses it, and we can speed up IMAP a bit this way.

	* camel-store.c (camel_folder_info_build): Redo this a bit to make
	it more useful for IMAP since that's the only thing that uses it.

	* camel-remote-store.c (camel_remote_store_connected): Public
	function to check if the store is connected, and try to connect it
	if it's not.
	(remote_send_string, remote_send_stream, remote_recv_line): Use
	that.

	* providers/imap/camel-imap-store.c (camel_imap_store_finalize):
	fix up for changes.
	(camel_imap_store_init): Initialize subscribed_folders to NULL
	rather than an empty hash table.
	(imap_connect): Get the list of subscribed folders here. If the
	server doesn't claim that any of them are either Marked or
	Unmarked, then assume that it doesn't do that for LSUB and
	remember that for later. If the server supports the NAMESPACE
	extension and the user didn't specify a namespace, use the
	server-provided one.
	(imap_disconnect): Free the list of subscribed folders, and the
	namespace.
	(get_folder): check camel_remote_store_connected
	(get_folder_info): check camel_remote_store_connected. Add a bunch
	of new cleverness. If we learned that the server doesn't do LSUB
	usefully, do a bunch of LISTs by hand. Then, if we're getting
	unread counts, only do it for folders that weren't listed as
	Unmarked. Also, deal with namespaces that end with the separator
	character, and update for changes to camel_folder_info_build.
	(folder_subscribed): Add a g_return_val_if_fail.
	(subscribe_folder, unsubscribe_folder): check
	camel_remote_store_connected.

	* providers/nntp/camel-nntp-store.c (build_folder_info,
	build_folder_info_from_grouplist, nntp_store_get_folder_info):
	Don't fill in message_count since it doesn't exist any more.

svn path=/trunk/; revision=7343