[configs] added
[config.opts] use clang opts from config
[gitmodules] use non ssl urls
[local.bin] updated master
[demos] updated
[external-libraries] updated
[dune-common] updated to 2.3.1
[dune-geometry] updated to 2.3.1
[dune-grid] updated to 2.3.1
[dune-istl] updated to 2.3.1
[dune-localfunctions] updated to 2.3.1
[dune-typetree] updtaed to 2.3.1
[dune-stuff] updated master
[dune-fem] updated
[dune-pdelab] updated
[dune-grid-multiscale] updated
[dune-pymor] updated
[dune-gdt] updated
[dune-hdd] updated
[configs] updated