* Problem: Source files contain no license info
Solution: Add comments with SPDX license info to source files
* Python 3 files don't need # -*- coding: utf-8 -*-
* Problem: Docs should say more about how to handle privacy & private data
Solution: Write a new docs page about that
* Problem: Server docs say little re/ prod. node security & privacy
Solution: Create a new docs page, "Production Node Security & Privacy"
* Address initial comments from @gautamdhameja
