EclipseWriter: support reordering of compressed cells, e.g. space filling curves.
EclipseWriter: fix docu of convertToEclipseOrder function.
remove unused restrictToActive method and rewrite the other one to cover both, restrict
and reorder.
Merge pull request #696 from dr-robertk/PR/eclipsewriter-support-cell-reordering

EclipseWriter: support reordering of compressed cells.