1998-10-06  Miguel de Icaza  <miguel@nuclecu.unam.mx>

	* src/cell.c (cell_modified): Cells from the clipboard do not have
	a Sheet parameter attached.

	* src/sheet.c (sheet_cell_add): Check the computed style:  if the
	computed style includes a format, then turn on the cell flag for
	format is set to avoid the auto guess of cell content.
	(sheet_style_compute): Now can return the flags of the style that
	were not part of the default style.

	* src/file.c (dialog_query_load_file, workbook_save_as): Put the
	window close to the mouse.

	* src/workbook.c (sheet_check_dirty, workbook_close): Do not
	cancel without warning the user if the workbook has changed.
	(workbook_new, workbook_can_close, workbook_window_destroy,
	quit_cmd, close_cmd): Reorganized the code to suit the new code to
	prevent inadvertent quits.