Reviewed the units of the functions (see FS#249) in dumux/matrial within the folders:

- binarycoefficients
- constraintsolver
- eos

- Units were added where required
- All units were checked that they are expressed in latex
- No additional doxygen errors or wanrings

Work done by Scholz
Reviewed and committed by Alexk

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@14706 2fb0f335-1f38-0410-981e-8018bf24f1b0