[toward-py3k] rewrite __cmp__ (closes #2715115)
In Python 3k `__cmp__` special method is no longer supported. So we split
it in `__lt__` and `__eq__`.
details on Python3k behavior here:
http://docs.python.org/3.0/whatsnew/3.0.html#ordering-comparisons
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html