Initial crap version of new members in this verison.
Group list of new members by classes.
Extract Columns class from Categories.

Let it manage the columns splitting logic so we can also share it
with new items list.
Split list of new members also into columns.

Use the Columns class to do the splitting in exactly the same way
as in Categories.
Render names of new classes as links.
Place new classes into separate section.

Instead of having the class names in headers be the links.
Remove accessor methods from new items list.
Move filtering methods of News to private section.
Turn importing off by default again.