Update History (starting 4/28/2015)

04/28/2015   00_iri2012.tar, irisub.for, irifun.for, iritest.for
07/12/2015   00_iri2012.tar, irisub.for, irifun.for, iritest.for, igrf.for
07/28/2015   00_iri2012.tar, irifun.for, cira.for
04/11/2018   irifun.for
04/16/2018   All IRI program files: Versioning now based on year of major releases