[tabularization] Tabularization doesn't use the same spacing everywhere when useVaporPressure=true

For use vaporPressure the liquid and gaseous states are tabularized separately both using the specified number of sample points. That leads to very different spacing throughout the parameter space. It would be more consistent to compute a spacing from the entire specified range and the specified number of sampling points and then use the same spacing to tabularize sub-spaces. That should also lead (with some tolerance) the total number of sampling point that the user specified.