Issue: FORMAT-PRETTY-PRINT (version 3)

["AITG::VANROGGEN" <vanroggen%aitg.decnet@hudson.dec.com>]

I think it's confusing to say that FORMAT always binds *PRINT-ESCAPE* to
NIL and also either binds it to T or NIL as required by various directives.

Furthermore, this would seem to disallow directives which don't bind any
of those *PRINT-xxx* variables.  VAX LISP has a ~W directive which prints
using the current *PRINT-xxx* bindings.

			---Walter
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