Bug 17813: (QA followup) Properly check DB structure before altering it
This patch makes the atomic update use the new functions introduced by
bug 17234 for checking the structure before attempting to call ALTER
TABLE.
It checks for the column existence, and also if it is a primary key.
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org> Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>