"CERN OHL" is not (no longer) sufficiently describing the rights and restrictions

[dl8dtl]

Just referring to "CERN OHL" is no longer sufficient. There are now three versions of the license, with different permissions and targets. For the part I contributed to the project, I'm fine to declare it as being used under the permissive version, CERN-OHL-P v2. If I read the CERN license correctly, we should also place a copy of the license into the tree, so it gets bundled with the source code.