[dune-pdelab] Current policy for gcc compatibility?

[Christian Engwer]

Hi Christoph,

> P.S.: According to our rule, dropping support for GCC 4.6 is
> possible on April 12, 2018.

to be fair we should mention, that these are rules for the core
modules. PDELab is not bound to this strict compatibility and I think
we have good reasons to require newer compilers. Although 4.6 would be
a bit too hard...

Cheers
Christian