mctools/ncrystal: NCrystal release 2.7.0

With 80 new NCMAT files, the NCrystal v2.7.0 release brings the largest increase yet to the NCrystal data library, bringing it to a whooping total of 131 materials for which we provide detailed scattering of thermal neutrons! 64 of the 80 new files are crystalline materials, and the other 16 new materials are amorphous solids, which is a new material type supported with this new release. Please let us know if materials relevant for your studies are still missing in our library.

In addition to the new materials provided, several new command-line utilities for NCMAT file creation and validation are added, a few bugs fixed, and HKL-list initialisation speed was increased dramatically.

For a slightly longer but still high-level overview of the new features and materials, please visit the Announcement-Release2.7.0 page in the wiki.

In connection with this release, a special thanks goes to Kemal Ramic and Jose Ignacio Marguez Damian from the ESS Spallation Group, whose dedicated efforts have been crucial in the creation and validation of the new materials.