Aquameta 0.2.0-rc3

Ho! Now comes version 0.2.0-rc3 of Aquameta.

Numerous enhancements including:

• All Aquameta core modules are now PostgreSQL EXTENSIONs
• Support for server-side templates that are dynamically rendered using plv8
• Ground-up security audit
• Installer now supports two security schemes, private and open-registration. Private databases do not accept new users, but open-registration databases allow anonymous users to sign up
• Refactor of all auth pages, including /register and /login.
• No more hard-coded installation directory, instead user chooses where to install
• Remove Docker support (until, or if ever, we convert it to docker-compose)
• Bundles can now be diff-ed with another remote copy of the bundle, showing commits that are unique to either the local or remote bundle
• Installation has been vastly simplified, prompting user for things like installation directory, security scheme, and superuser credentials
• Events have been resurrected to be much closer to working
• Complete refactor of code and extension filesystem layout, moving all postgresql extensions and python packages into the src/ directory
• Switch to using PostgreSQL version 10
• Numerous bug fixes and misc. enhancements