Use iterator methods on dicts where possible.
Run 2to3 when building Formencode.

Make test package a subpackage.
python setup.py nosetests now works properly.
Some adaptions for Python 3.
Add important option for Python 3 doctests.
Make test for deprecation warnings work with Python 3.
Small fix in test_htmlfill.
Adapt doctest output checker for Python 3.
More adaptions for Python 3.
Merge branch 'master' of https://github.com/formencode/formencode