introducing quad precision floating point support
this is an aid for debugging precision problems. in order to use this, add --enable-quad to the CONFIGURE_FLAGS of your options file, re-run dunecontrol, include the header file "dumux/common/quad.hh" after config.h and *before* everything else. next, set the Scalar property to 'quad'. finally, you need to patch Dune::className() to not access the typeid method, for example by returning a constant string like "<unknown>" (so far, typeids are not yet generated for quad precision floating point values by GCC which I consider to be a compiler bug...) git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@6534 2fb0f335-1f38-0410-981e-8018bf24f1b0
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