remove deprecated 1p cellData and fluxData files

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@11770 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/decoupled/1p/cellData1p.hh

-#warning This file is deprecated. Use celldata1p.hh (non-capitalized) instead.
-#include "celldata1p.hh"

dumux/decoupled/1p/fluxData1p.hh

-#warning This file is deprecated. Use fluxdata1p.hh (non-capitalized) instead.
-#include "fluxdata1p.hh"