2001-05-26  Jon K Hellan  <hellan@acm.org>

	* src/sheet-control-gui.[ch]: Derive from SheetControl rather than
	GtkObject.

	* src/gnumeric.h: Add incomplete def of SheetControl.

	* src/Makefile.am: Add sheet-control.c, sheet-control.h,
	sheet-control-priv.h

	* src/sheet-control.c: New file. Stub base class for
	SheetControlGUI.

	* src/sheet-control.h: Strip down even more from existing stub in
	CVS.

	* src/sheet-control-priv.h: New file. Private header for
	SheetControl.