Fix sorting for "Other Editions" menu
Right now, externally hosted conference websites are rendered after the editions in conf.researchr.org. It might be the case that a more recent edition is hosted externally, while there is an older edition hosted by our system. The order of other editions should reflect the order in time, independent of the hosting used.
Submitted by Elmer van Chastelet on 27 November 2017 at 11:13