Plug leaks.

Plug leaks.

        * camel-object.c (camel_object_hook_event):
        * camel-uid-cache.c (camel_uid_cache_get_new_uids):
        * camel-url.c (camel_url_new_with_base): Plug leaks.

        * camel-remote-store.c (camel_remote_store_init): Don't
        re-initialize the folders hash table.

        * providers/imap/camel-imap-store.c (imap_disconnect): Free
        authtypes since they'll be re-read on re-connect.
        (get_folder_info): Free folderinfos that we're discarding from the
        list.