Document and modify to return a boolean value denoting whether or not

Document and modify to return a boolean value denoting whether or not

2001-03-18  Jeffrey Stedfast  <fejj@ximian.com>

	* camel-filter-driver.c (camel_filter_driver_filter_message):
	Document and modify to return a boolean value denoting whether or
	not errors occured during processing.
	(camel_filter_driver_filter_mbox): Same as above and also modified
	to check return codes of filter_message rather than relying only
	on whether or not the exception was set (as it's possible to pass
	in NULL for the exception).
	(camel_filter_driver_filter_folder): Same as above.

	* camel-mime-utils.c (header_param_list_format_append): Quote the
	param value if it contains whitespace as well.