Fixed meal plan did not load when a containing recipe was deleted (closes #361)

migrations/0089.sql

@@ -0,0 +1,9 @@
+CREATE TRIGGER remove_recipe_from_meal_plans AFTER DELETE ON recipes
+BEGIN
+	DELETE FROM meal_plan
+	WHERE recipe_id = OLD.id;
+END;
+
+-- Delete all recipes from the meal plan which doesn't exist anymore
+DELETE FROM meal_plan
+WHERE recipe_id NOT IN (SELECT id FROM recipes);