EDIT

ref #9659 database table scheme for ext_links

ref #9659 ext_links overview: removing ensable/disable action

ref #9659 fixing ext_links edit link

ref #9659 admin overview improved and edit form ready

ref #9659 admin overview on ext_links working

ref #9599 commenting looging

ref #9599 better error reporting

ref #9599 showing error in case of reference/{uuid}/nomenclaturalCitation usage

using again const instead of define()

bumping minimin php version to 5.6