SRFI 78 revision available

[David Van Horn <dvanhorn@xxxxxxxxxxxxxxx>]

SRFI 78 Lightweight testing has been revised and is available at:

   http://srfi.schemers.org/srfi-78/srfi-78.txt

Changes include:

* Neil Van Dyke's Testeez library is discussed.
* (arg ...) is now optional in CHECK-EC
* several minor changes in the text