0.9.7claws11

0.9.7claws11

* src/folder.[ch]
* src/imap.c
* src/localfolder.[ch]
* src/mh.c
* src/news.c
* src/common/xml.[ch]
        add set_xml() and get_xml() virtual functions to FolderClass to
        save extra information for Folders (for example the rootpath
        only used by LocalFolder). The folderlist write function no
        longer needs to know the folder type to save this extra
        information.