Bug 10212: Columns configuration for tables - POC

Bug 10212: Columns configuration for tables - POC

This patch proves that this feature is useful with a concret use case.

Test plan:
1/ Execute the updatedatabase in order to create the new table.
2/ Take a look to the yml structure.
3/ Go on the admin currency page (admin/currency.pl).
4/ Check that you cannot hide the 2 first columns on the table.
5/ Try to hide/show columns.
6/ Go on the columns configuration page (admin/columns_settings.pl).
7/ Only the admin tab are filled with data. Check/uncheck checkboxes and
save.
8/ Go on the admin currency page and check that the behavior is what
you expected.
9/ Give me some feedback :)

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>