IF and PROGN

[ALAN at MIT-AI (Alan Bawden)]

	Just a clarification of how I use IF.

Code such as:

	(IF (TEST A)
	    (PROGN (FOO) (BAR))
	    (BAZ))

Is never prefered to using COND as far as I am concerned.  IF is only useful
in those simple cases where it improves readability.  I would prefer to read
a two clause COND than to have to search for a keyword.