New Human-like Play and Analysis + quick bugfix

This is not the latest release - see the release v1.15.3 for various bugfixes and the versions that you should actually use.
Still see the v1.15.0 release page for help and documentation and pretty pictures about the major features released with v1.15.x, although the executables there are outdated and/or more buggy compared to v1.15.3

This is a quick bugfix for v1.15.0 that fixes a minor issue with the Analysis Engine where it would report an error when querying the version. This release also slightly clarifies the documentation in gtp_human5k_example.cfg on how to use the new Human SL model released with v1.15.0. Please continue to report any issues and we will fix them. :)