- at long last have gotten the "proxy_property" keyword

- at long last have gotten the "proxy_property" keyword
arg of register_descriptor to not be needed.   synonym, comparable, concreteinherited
props now supply a descriptor directly in the class dict, whose
__get__(None, cls) supplies a QueryableAttribute.   The basic idea is that
the hybrid prop can be used for this.   Payoff here is arguable, except that
hybrid can be at the base of future synonym/comparable operations.