2000-02-29  Miguel de Icaza  <miguel@nuclecu.unam.mx>

	* src/cell.c (cell_content_changed): Notify the sheet that the
	cell changed using sheet_cell_changed.

	* src/sheet-vector.c: New file.  Implements the Gnumeric:Vector
	interface (and supports non-contiguous ranges)

	* src/sheet.c (sheet_destroy): free private structure.
	(sheet_new): init private structure.
	(sheet_cell_changed): New function.

	* src/sheet-private.h: New file.

	* src/sheet.h: Sheet structure includes SheetPrivate field now.