Remove use of the avant package; Helvetica isn't as pretty, but works for

acroread.  The problem this solves is likely dependent on font availability,
so keeping things simple is a good solution.

Doc/texinputs/pypaper.sty

@@ -16,4 +16,3 @@
 %  package.
 %
 \RequirePackage{times}\typeout{Using Times instead of Computer Modern.}
-\RequirePackage{avant}\typeout{Using AvantGarde instead of Helvetica.}