[Gzz] cellview_naming

[Tuomas Lukka]

benja wrote:

>
>``CellInBox`` is a nice interface, but not a nice name. Let's rename:

Agreed

>- ``CellInBox`` to ``CellView``

Agreed

>- ``CellView`` to ``CellBoxView``
>
>``CellContentView`` keeps its name. This makes sense because after all,
>both ``CellBoxView`` and ``CellContentView`` are just ways to view
>a cell, one with and one without a box around.

I disagree; having separate interfaces makes using CellInBoxHook a bother:
you can't then use it for either of the derived interfaces, since they
are abstract classes..

>Additionally, after this change, add all three classes to the list
>of frozen classes (or, when ``view_split--tjl`` is implemented,
>simply add ``gzz.view`` to the list of frozen packages).

Agreed.

        Tuomas