* according to Rene

* this defines CHECK_CRTP and CHECK_AND_CALL_CRTP
  (has still to be made threadsafe perhaps?)
* defines CRTPInterface

* there is now DUNE_THROW_COLORFULLY :)

* copyright decision still open

* we still need to decide if we want to have project wide
  copyright holders (if yes, who?) or per-file

* use one template which either redirects scalars to
  dune-common and checks vectors componentwise
* this template is then generated for eq, ne, gt, lt, ge and le

* LA::VectorInterface
* LA::EigenDenseVector

* rename DSC_TOSTR -> DSC_FRSTR
* group toString/fromString

Conflicts:
	dune/stuff/common/profiler.cc

sum and maximum value need to be computed on _every_
process and may then be output only on rank 0.