Move path and link_name related functions and regex patterns to a new
soc/logic/path_linkname.py module, and fix all dependencies. path/link_name
functionality is becoming the generic way to identify entities in the Datastore
in a URL-compatible way.
# coding: utf-8
r"""
>>> from django.contrib.comments.models import Comment
>>> from django.contrib.auth.models import User
>>> u = User.objects.create_user('commenttestuser', 'commenttest@example.com', 'testpw')
>>> c = Comment(user=u, comment=u'\xe2')
>>> c
<Comment: commenttestuser: â...>
>>> print c
commenttestuser: â...
"""