Copyright year fix in <odreex/ppmpf/algorithm/fldaux.hh>
Copyright year fix in <odreex/ppmpf/algorithm/fldaux.hh>

Much of the code introduced in this header was excised from its fold.hh
counterpart during refactoring; fldaux.hh in this case is thus derived
from the 2013 codebase in odreex/ppmpf and therefore this change is
justified.

irrequietus/clause,irrequietus/clause