Currently we have 3 subroutines to retrieve the columns of tables:
C4::Members::columns, C4::Items::columns and
C4::Items::biblioitems_columns.
It is easier to have a Koha::Objects->columns method to provide the
different classes to retrieve their related column names.
Signed-off-by: Mark Tompsett <mtompset@hotmail.com> Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com> Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>