* camel-provider.h: Add an "extra_conf" field to CamelProvider
	with structures and defines and stuff, for providers to specify
	additional configuration options that they want. Also add a
	"supports ssl" flag to the provider flags.

	* camel-remote-store.c: add a "default_ssl_port" field.
	(remote_construct): If the URL has the "use_ssl" parameter, set
	the store's use_ssl flag.
	(remote_connect): If using SSL and no port specified, use the
	default_ssl_port rather than the default_port.

	* providers/smtp/camel-smtp-provider.c (smtp_provider): add
	CAMEL_PROVIDER_SUPPORTS_SSL and CAMEL_URL_ALLOW_USER. (The config
	gui code knows that the ALLOW_USER and ALLOW_AUTH go together.)
	(ssmtp_provider): gone

	* providers/smtp/camel-smtp-transport.c (smtp_construct): Set a
	flag if "use_ssl" param is set.
	(smtp_connect): Check the CamelSmtpTransport use_ssl flag rather
	than checking if this is smtp or ssmtp.

	* providers/imap/camel-imap-provider.c (imap_conf_entries): Add a
	bunch of IMAP-specific configuration options, like "check for new
	mail in all folders" (default TRUE), "show only subscribed
	folders" (default TRUE), "ignore server-supplied namespace", and
	"apply filters to INBOX" (not yet implemented).
	(imap_provider): We support SSL and we no longer allow a path in
	the URL. (namespace is handled via extra_conf)
	(simap_provider): Gone

	* providers/imap/camel-imap-store.c (camel_imap_store_init): Set
	default_ssl_port, don't set CAMEL_STORE_SUBSCRIPTIONS here
	(construct): remove simap stuff, deal with "use_lsub",
	"namespace", "check_all", and "filter" parameters. Set base_url
	to not include params.
	(imap_store_setup_online): Don't ask for the namespace if it was
	set explicitly. Don't get subscribed folders if !use_lsub.
	(imap_concat): Fix a bug.
	(get_folder_info): Support for not checking all folders.

	* providers/pop3/camel-pop3-provider.c (pop3_conf_entries): "keep
	on server" (currently still implemented by the mailer code, not
	here), "delete after N days" (not yet implemented).
	(pop3_provider): we support SSL
	(spop_provider): gone

	* providers/pop3/camel-pop3-store.c (camel_pop3_store_init): Set
	default_ssl_port
	(pop3_connect): Remove spop code

svn path=/trunk/; revision=8968