Nuke Serializable in favor of Stateful. Got rid of some warnings with stub code. git-svn-id: svn://localhost/ardour2/branches/undo@767 d708f5d6-7413-0410-9779-e7cbd77b26cf
Trunk merge conflicts resolved git-svn-id: svn://localhost/ardour2/branches/undo@756 d708f5d6-7413-0410-9779-e7cbd77b26cf