Added a new DESTROY_MANAGER function that works with the objects when they have the manager stored in them, ensuring that every object no longer keeps its reference to the manager.
Added a new DESTROY_MANAGER function that works with the objects when
they have the manager stored in them, ensuring that every object no
longer keeps its reference to the manager.


git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@727 3c1deb5b-d424-0410-962d-aba41a686d42

hsorby/zinc,OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc