Stable and production tested NNVMC package

Merge pull request #3 from DCM-UPB/cmake

Cmake + small overhaul

Code used for NNVMC article (2019)

This is a snapshot of the NNVMC library as it was when employed for production of data for the (to be published) article about NNVMC by J. Kessler, F. Calcavecchia and T.D. Kühne in early 2019.

Although it was used successfully in production, this snapshot is not necessarily stabilized and well documented for public use. A better polished version is intended for the future and will be "released" as v0.2 .