use C++14 type aliases

dune/fem-dg/algorithm/caller/adapt.hh

dune/fem-dg/algorithm/caller/checkpoint.hh

dune/fem-dg/algorithm/caller/datawriter.hh

dune/fem-dg/algorithm/caller/diagnostics.hh

dune/fem-dg/algorithm/caller/postprocessing.hh

dune/fem-dg/algorithm/containers.hh

dune/fem-dg/algorithm/createsubalgorithms.hh

dune/fem-dg/algorithm/evolution.hh

dune/fem-dg/algorithm/steadystate.hh

dune/fem-dg/algorithm/sub/containers.hh

dune/fem-dg/assemble/assemblertraits.hh

dune/fem-dg/assemble/primalmatrix.hh

dune/fem-dg/examples/advdiff/algorithmcreator.hh

dune/fem-dg/examples/dataio/algorithmcreator.hh

dune/fem-dg/misc/combinedfunctionspace.hh

dune/fem-dg/misc/tupleutility.hh

dune/fem-dg/models/defaultmodel.hh

dune/fem-dg/operator/dg/operatorbase.hh

dune/fem-dg/operator/limiter/limitpass.hh