More migration from python 2 to python 3, simplification in pad serving views, moved all to logn required.

Remove some links from the logged-out view for the same purpose

fixes indexing a.o.

It was not working correctly, so better have one way to do it (front-end) and to make sure it works

`python manage.py index` scrapes the site for RDF/A and than generate an index from it

What’s nice is that this part doesn’t need a database—
we create the graph each time from scratch.

We then convert the RDF/A to a form the template can handle, store it in a json,
and the index view uses this.

We truncates the existing pad names with a south migration to less than 50 characters to stick to Etherpadlite model

restriction.
But there is still the issue of having pads with the same name.

Because the field is still in the database and marked as required.

Putting in a migration is more hassle then it’s worth.
So we keep it around and go with Steph’s solution:
exclude it from the admin.

We’ll just have one title_field shared between title and uri,
Wikipedia style

    We need access to more recent API methods.
    This just got merged: https://github.com/devjones/PyEtherpadLite/pull/6

    So do:

        pip uninstall pyetherpadlite
        pip install https://github.com/devjones/PyEtherpadLite/archive/master.zip

    So this is kind of convoluted. With an input like

    Relearn::Can it scale to the universe

    we get a pad, with the unchangeable id:

    relearn::can-it-scale-to-the-universe

    This id becomes the initial value for the (changeable) url slug, as display_slug.
    Based on this id we also set the (changeable) display name, as display_name,
    through a slight transformation (- becomes space, :: →) as in:

    relearn → can it scale to the universe

After migration, update existing install as such:

from etherpadlite.models import Pad
from relearn.templatetags.wikify import dewikify

for pad in Pad.objects.all():
    pad.display_slug = pad.name
    pad.display_name = dewikify(pad.name)
    pad.save()

Pull in the django etherpadlite bridge fork from https://github.com/codingisacopingstrategy/django-etherpad-lite/zipball/master

We need to edit these models