* 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
* Problem: No docs explaining use of MongoDB for querying
Solution: Start a new root docs page explaining how a node operator can use the full power of MongoDB's query engine, and can expose as much of that as they like to end users.
* Finished first draft of new docs page 'Querying BigchainDB'
The docs page about timestamps in BigchainDB was temporarily removed from the docs by PR #817. The timestamps.md file itself was put back (and edited) but it was never put back in the index. This commit puts it back in the index.
