name for SEFTable

[Eric Dean Tribble <tribble>]

note that C++ uses 'const' incorrectly.  You can have a 'const'
pointer to an object that change state because another object has a
non-const pointer.  That's why immutability is different from 'const'.
An immutable object can't have its state changed at all.

My description of a 'const' class was just to clarify my preceding
description.  I don't actually care if we use const, just how close
the semantics are.

dean