Changed NautilusViewFrame to allow creation of `Nautilus::View' objects
* libnautilus/ntl-view-frame.c, libnautilus/ntl-view-frame.h: Changed NautilusViewFrame to allow creation of `Nautilus::View' objects that have additional interfaces while sharing the actual control. This will allow, for instance, the creation of components that are both a `Nautilus::View' and a `Bonobo::Embeddable'. The basic changes are to require a `BonoboObject' with a `Bonobo::Control' interface at construction time. - Two creation functions are provided: `nautilus_view_frame_new', which takes a GtkWidget, creates a new control that contains that widget, and the constructs a NautilusViewFrame with that control, and `nautilus_view_frame_new_from_control', which creates a NautilusViewFrame that gets added as an additional interface to an existing control. - In the course of doing this it became clear that it would be easier if NautilusViewFrame were changed to inherit from BonoboObject rather than GtkBin, so this was done; as a result, the nautilus_view_frame_get_bonobo_object call was removed, since the view_frame _is_ a bonobo object. However, a nautilus_view_frame_get_bonobo_control call was added as a convenience, to allow other code to avoid having to query_local_interface for the control object manually. * libnautilus/ntl-meta-view-frame.c, libnautilus/ntl-meta-view-frame.h, libnautilus/ntl-content-view-frame.c, libnautilus/ntl-content-view-frame.h: Analogous changes; mainly, added `nautilus_meta_view_frame_new', `nautilus_meta_view_frame_new_from_control', `nautilus_content_view_frame_new' and `nautilus_content_view_frame_new_from_control'. * components/help/hyperbola-nav-index.c, components/help/hyperbola-nav-tree.c, components/history/ntl-history-view.c, components/html/ntl-web-browser.c, components/notes/ntl-notes.c, components/websearch/ntl-web-search.c, src/ntl-app.c, src/file-manager/fm-directory-view.c: Fixed initialization and object creation functions to deal with the above API change.
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