Improve MSP documentation

Rename "Mesh Streaming Protocol" to "Mesh Stream Protocol"
Add CC-BY-4.0 license text
Add Tunnelling document (TCP over MSP)
Add copyright notices and CC-BY license to README.md and INSTALL.md
Add doc/README.md
Squelch rhizome sync messages if rhizome is disabled
Be more careful setting alarm times
Add support for STOPping a connection before shutdown
Add text of CC BY 4.0 license

Add LICENSE-DOCUMENTATION.md (commons deed) and CC-BY-4.0.md (legal
text)

All docs link to local commons deed instead of CC BY 4.0 web page
Fix "unused parameter" warnings for undefined HAVE_JNI_H