Libvdwxc clean classes
Refactor libvdwxc module separating distinct functionality into different classes.
Remove deprecated classes.
Add libvdwxc tostring() interface. Requires new libvdwxc.
Refactor libvdwxc module separating distinct functionality into different classes.
Remove deprecated classes.
Add libvdwxc tostring() interface. Requires new libvdwxc.