Increase pagination size to 20 elements.
Split page in ``top`` and ``bottom`` sections.

The ``page`` object splits the object_list in the bottom
and top sections. Usage::

    page.object_list_top
    page.object_list_bottom
Increased the pagination size and slicing area.

The objects listed in a page must fit 3 and 4 items
in the same row. This is why each section contains
12 items and there are 24 items per page.
Implement segmented lists in reusable list template.
Increase the number of dummy apps generated.
Add ``BlogLinks`` model for the blog sidebar.

These URLs are links to other properties in the web.
Add ``BlogLinks`` to the admin section.