Columns must be restored each time a new instance of SQLlisting is created. (static member issue)
Columns must be restored each time a new instance of SQLlisting is created. (static member issue)

see #155

carragom/modoboa,bearstech/modoboa,carragom/modoboa,modoboa/modoboa,modoboa/modoboa,mehulsbhatt/modoboa,tonioo/modoboa,bearstech/modoboa,tonioo/modoboa,mehulsbhatt/modoboa,modoboa/modoboa,bearstech/modoboa,modoboa/modoboa,bearstech/modoboa,RavenB/modoboa,mehulsbhatt/modoboa,RavenB/modoboa,tonioo/modoboa,carragom/modoboa,RavenB/modoboa