Error in brine density calculation according to Batzle and Wang in brine.hh. Exchanged + with - in the formula. This change is significant for brines with a high temperature and a high salinity.
Accordingly the reference results for co2 (box and cc) and co2ni (box and cc) are updated, although changes are very small.
Reviewed by Lena.

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@10726 2fb0f335-1f38-0410-981e-8018bf24f1b0