Merge branch 'master' into 'fix_compiler_error_with_onedgrid'

.gitlab-ci.yml

CMakeLists.txt

dune-gfe.pc.in

dune.module

dune/gfe/CMakeLists.txt

dune/gfe/averagedistanceassembler.hh

dune/gfe/averageinterface.hh

dune/gfe/cosseratenergystiffness.hh

dune/gfe/cosseratvtkwriter.hh

dune/gfe/embeddedglobalgfefunction.hh

dune/gfe/geodesicfeassembler.hh

dune/gfe/harmonicenergystiffness.hh

dune/gfe/localgeodesicfefunction.hh

dune/gfe/localgfetestfunctionbasis.hh

dune/gfe/localquickanddirtyfefunction.hh

dune/gfe/mixedgfeassembler.hh

dune/gfe/mixedriemanniantrsolver.cc

dune/gfe/mixedriemanniantrsolver.hh

dune/gfe/nonplanarcosseratshellenergy.hh

dune/gfe/parallel/globalp1mapper.hh