Fix issue52

xlsx_builder_pkg will be invoker rights

ora/xlsx_builder_pkg.pkb

@@ -1949,6 +1949,7 @@ style="position:absolute;margin-left:35.25pt;margin-top:3pt;z-index:' || to_char
       then
         dbms_sql.close_cursor( t_c );
       end if;
+    raise;
   end;
 end xlsx_builder_pkg;
 /

ora/xlsx_builder_pkg.pks

@@ -1,5 +1,5 @@
 create or replace package xlsx_builder_pkg
-as
+authid current_user as
 /**********************************************
 **
 ** Author: Anton Scheffer