Bug 29648: Improve existing code

Bug 29648: Improve existing code

We already have 2 tables that are configurable, on acqui/basket and
reports/orders_by_budget.
This patch is modifying a bit the existing code to transfer the
responsability/logic to the KohaTable constructor instead of the
template that is creating the object.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>