latest models
remove unused import
update models library - fix #357
FAQ: mention that commercial licenses are available

copied the text for this from copyright.html
relocate Models Library to GitHub
Merge remote-tracking branch 'origin/5.0.x'
Merge remote-tracking branch 'origin/master' into core

Conflicts:
	bin/submodules.sh
	docs/faq.html
Merge remote-tracking branch 'origin/core' into headless