Compatible with newer PyPDF2 versions

Issue was z3c.rml accessing a protected property of PyPDF class whose behavior had changed between versions.

Wasn't sure about buildout.cfg line 85.

Also wasn't sure if we needed page.py lines 36-45 at all, since the tests all passed in versions 1.21, 1.22, and 1.23 with those files completely deleted. Decided to play it safe and leave them in there.