Unified name properties

[Keisuke Nishida]

Hello,

There are lots of procedures that return the name of an object,
including procedure-name, macro-name, module-name, class-name, etc.

How about unifying these procedures by a single procedure `name',
using the new property scheme?

  (define name (make-object-property))

  (name assq) => assq
  (name <class>) => <class>

This is also compatible with generic functions.