Moved hyperlog license notice in order to avoid R CMD build/check warning

Moved hyperlog license notice in order to avoid R CMD build/check warning;

I used Wayne Moore's Java implementation of Hyperlog and "translated it" to C++ to include it in R. Wayne's Java code is open source, but this notice is supposed to be included with the source code whenever someone uses or modifies it. Although I put it in a different language, I feel that it is still Wayne's code underneath and therefore, this file should be included. Originally, I kept it with directly with the sources in the src folder, but R CMD build/check is giving a warning about that, so I moved it. Feel free to move it elsewhere if you think there is a more appropriate place for it.