Rewrite a bunch. Replace the existing folder cache stuff with much simpler

Rewrite a bunch. Replace the existing folder cache stuff with much simpler

	* camel-store.c: Rewrite a bunch. Replace the existing folder
	cache stuff with much simpler code that still handles all the
	existing cases. Now the folder hash table is always created by the
	base class, using hash and compare functions provided by the class
	implementation. (If they are set to NULL, CamelStore won't cache
	folders.) lookup_folder, cache_folder, and uncache_folder are no
	longer class methods, and get_name is gone completely.

	(camel_store_get_inbox): Renamed from
	camel_store_get_default_folder, since that wasn't being used, and
	this is what we actually need.
	(camel_store_get_root_folder): Removed, since it's not needed for
	anything given get_folder_info.

	* camel-remote-store.c:
	* providers/local/camel-local-store.c:
	* providers/local/camel-mbox-store.c:
	* providers/local/camel-mh-store.c:
	* providers/local/camel-maildir-store.c:
	* providers/nntp/camel-nntp-store.c:
	* providers/pop3/camel-pop3-store.c:
	* providers/vee/camel-vee-store.c: Minor updates for CamelStore
	changes

	* providers/imap/camel-imap-store.c (camel_imap_store_class_init):
	Update for CamelStore changes.
	(hash_folder_name, compare_folder_name): treat INBOX
	case-insensitively, otherwise use g_str_hash and g_str_equal.

	* camel-service.c (camel_service_construct): Remove
	camel_service_new and create camel_service_construct (as a class
	method) in its place.

	* camel-session.c (camel_session_get_service): Use
	camel_object_new and camel_service_construct to replace
	camel_service_new.

	* providers/local/camel-local-store.c (construct): Append a '/' to
	the URL path if it doesn't end with one