[common.exceptions]
* give mpi info in parallel runs
* overwrite DUNE_THROW
[grid.entity]
* take an optional name
* do not flush
[common.print] do not flush manually
Revert "[la.solver] try to fix istl parallel solver"

This reverts commit 2c72dfaf22fb82f0f886304bb6d0487cfc7ae982.
Revert "[solver] fixes parallel istl runtime error"

This reverts commit 14c733b260a9218562f6093395d9e6d868bbb8e3.
Revert "[solver] prototype parallel ssor bicg implementation"

This reverts commit 9a38200e322981d293c7f4412146235d0d5eba1c.
[la.solver] prepare for parallel case
* all solvers get an optional additional argument
* reorder the istl solver to only show the amg one in parallel