* gourmet/plugins/import_export/mealmaster_plugin/mealmaster_importer.py (mmf_constants.__init__): servings->yields

	* gourmet/plugins/import_export/krecipe_plugin/krecipe_importer.py (KrecHandler): servingsyields->

	* gourmet/importers/importer.py (Importer.commit_rec): Update servings->yields.

	* gourmet/backends/db.py (RecData.add_rec): Update servings/yields
	code.

	* gourmet/exporters/exportManager.py
	(ExportManager.offer_multiple_export): Close #234, #691.