Update settings to work with Django 1.4

http://stackoverflow.com/questions/11904609/configuring-django-settings-to-work-with-1-4-1-loading-template-error
Adjust URLs for new version of django-auth-openid
INSTALL: update dependencies for wheezy
debian: fix lintian error in copyright file
INSTALL: update distro version
fab: generate packages for wheezy, not squeeze
Work-around pylint warnings for hashlib

This should have no effect on the code's functionality but it seems
like the right thing to do for newer versions of hashlib.

Also ignore a warning that looks bogus.
Re-indent tests and settings file to make pep8 happy

Also ignore some new pep8 errors because they lead to very large
leading gaps.
Bump changelog for deployment
INSTALL: remove Django 1.2-specific instructions
Merge branch 'wheezy'
Bump the maximum size for photo crops to 7000x7000
Add 312x312 to the list of sizes to pre-generate

Not sure where that size comes from, but it's quite commonly
requested these days.
Replace AppsAttic with Rackspace in sponsors area