Update to used KIM-API version 2.0.0 (final versus beta-1)

Branch: schiotz/amp:fix-openkim
Branch: andrewpeterson/amp:master
Open
Description
Update the OpenKIM driver to use the released version 2.0.0. A number of things had changed since OpenKIM API version 2.0.0.beta1:
A number of function calls had been renamed.
The logging system had been revamped
CMake is now used to build KIM extensions instead of a Makefile.
Best regards
Jakob and August