Added a method to create a Properties object that accesses subproperties  by filtering a referenced base Properties, rather than creating an  entirely new set of Properties, to avoid creating loads of garbage when  filtering through multiple levels of subproperties.
Added a method to create a Properties object that accesses subproperties 
by filtering a referenced base Properties, rather than creating an 
entirely new set of Properties, to avoid creating loads of garbage when 
filtering through multiple levels of subproperties.


git-svn-id: 64ebf368729f38804935acb7146e017e0f909c6b@1943 6335cc39-0255-0410-8fd6-9bcaacd3b74c

samskivert/samskivert,samskivert/samskivert