0.9.0claws76

0.9.0claws76

* src/folder.[ch]
* src/imap.c
* src/mbox_folder.c
* src/mh.c
* src/news.c
        move folder_item_get_path() stuff into a folder virtual function

* src/procmsg.c
        use folder_item_fetch_msg() to get message and do not contruct
        the filename from path and number