sequential works without polzmorhpism
use correct offsets when accessing coordinate vectors
[cleanup] makelevel needs less paramters
previously introduced ygrid member coordoffset is always equal to offset and is dropped
cleanup
rename TransformingSubIterator to SubIterator
more cleanup
switch to Dune::array<int,dim> completely
fix coordVector template parameter list
remove all this-> because there is no polymorphism anymore
remove redundant grid data in iterator
introduce template paramtere on yaspgrid for the coordinate container
Major update

Coordinate Information now is a container that can be interchanged
for equidistant and tensorproduct grids.
update test suite to check both equidistant and tensorproduct grids