Waldo interface

[Ravi Pandya <ravi>]

This issue is related to the issue of making the front end separable
from the back end over a socket. There aren't actually that many
classes that can be privatized, though, since any class that defines
new protocol must be public, as must any superclass of a public class.
This leaves only Map, DirectRecord, and MappedRecord. I can only
suggest splitting them up into smaller files.
	--ravi