blanchet [Wed, 04 Feb 2009 18:10:07 +0100] rev 29802
Make some Refute functions public so I can use them in Nitpick,
use @{const_name} antiquotation whenever possible (some, like Lfp.lfp
had been renamed since Tjark wrote Refute), and removed some "set"-related
code that is no longer relevant in Isabelle2008. There's still some "set"
code that needs to be ported; see TODO in the file.