added CMakeSettings.json for working with VisualStudio
added missing "template" to dependent template-function calls

Co-authored-by: Tobias Loew <tobi@die-loew.de>

Add test for neff; it is undefined for vdW EOS, interesting

Isochoric derivatives moved into their own namespace

Bug in mcx with negative arguments to pow(x,2.0), square fixes it

Polishing missing still, otherwise done?

Doesn't work  so far

Not especially fast

Lots of testing remains for other numerical types