run-random-game: default to -Completed, exit cleanly if no games

Signed-off-by: Christopher Larson <kergoth@gmail.com>
setup-osx: apply the sysctls immediately also

Signed-off-by: Christopher Larson <kergoth@gmail.com>
setup-osx: auto-install homebrew, and adjust /usr/local and /opt perms

Signed-off-by: Christopher Larson <kergoth@gmail.com>
mercurial: install the evolve extension

Signed-off-by: Christopher Larson <kergoth@gmail.com>