templatization of archive.today links: cope with doubly archived urls
urls such as
https://archive.today/20160121014341/http://wayback.archive.org/web/20120815110504/http://www.tagesschau.de/inland/wahlanalyse114.html
should not be converted to
{{webarchive | url=http://wayback.archive.org/web/20120815110504/http://www.tagesschau.de/inland/wahlanalyse114.html| archive-is=20160121014341| text=''Hannelore Kraft sticht alle aus''}}
but to
{{webarchive | url=http://www.tagesschau.de/inland/wahlanalyse114.html| archive-is=20160121014341| text=''Hannelore Kraft sticht alle aus''}}
or
{{webarchive | url=http://www.tagesschau.de/inland/wahlanalyse114.html| wayback=20120815110504| text=''Hannelore Kraft sticht alle aus''}}