configcontainer.hh:39:13: note: copy assignment operator of 'Request' is implicitly deleted because field 'line' is of const-qualified type 'const int'
  const int line;
            ^

http://stackoverflow.com/a/8165154

This reverts commit c7040907008337517833c460dad4474f8b727c2f.

Conflicts:
	dune/stuff/common/parameter/tree.hh
	dune/stuff/la/solver.hh

it's much better to inform the user about missing Logger initialization