Now we have support for registering/unregistering file opening
and saving formats.

Miguel.

1998-12-28  Miguel de Icaza  <miguel@nuclecu.unam.mx>

	* plugins/excel/boot.c: New file, this holds the probing and load
	wrapper code for Gnumeric to use as well as the initial format
	registering code.

	* src/xml-io.c (xml_probe): New routine, used to probe if a file
	is a Gnumeric-xml file.

	* src/file.c (file_format_register_open,
	file_format_unregister_open, file_format_register_save,
	file_format_unregister_save): New routines used to register and
	unregister file formats in Gnumeric.

	* src/main.c (main): Boot xml and excel formats, since they now
	need to register themselves with the file.c code