- added aux script to delete timesheet costs

sql/postgresql/aux_delete_timesheet_costs.sql

+-- aux_delete_timesheet_costs.sql
+--
+-- Auxillary Script: Delete all cost items generated by the 
+-- timesheet cost sweeper.
+-- Executing this script is useful if you want to recalculate
+-- all timesheet costs based on a new compound cost rate 
+-- during the installation of ]po[.
+
+create or replace function inline_0 ()
+returns integer as '
+DECLARE
+    row                         RECORD;
+BEGIN
+    -- Remove links to cost items
+    update im_hours 
+    set cost_id = null;
+
+    FOR row IN
+        select  *
+        from    im_costs c
+	where	cost_type_id = 3718
+    LOOP
+        RAISE NOTICE ''Deleteting cost_item: %'', row.cost_id;
+
+--	update im_hours 
+--	set cost_id = null
+--	where cost_id = row.cost_id;
+
+	PERFORM im_cost__delete(row.cost_id);
+
+    END LOOP;
+    return 0;
+END;' language 'plpgsql';
+select inline_0 ();
+drop function inline_0();