Behave as a drop-in replacement for notmuch

[BjarniRunar]

Target commands:

• new
• count
• search
• address
• tag
• show
• reply

Other commands we probably will NOT emulate.

Output formats:

• text
• text0
• json
• sexp

Other things:

• GnuPG support
• Document the commands
• Document how the commands can be used as a web API for integration or client development

[BjarniRunar]

When enough of this stuff works, we take one of the notmuch frontends and port to use moggie instead: voila, we have an e-mail client!

[Aiminsun]

This is truly above and beyond. Keep it up.

[BjarniRunar]

Marked more things done.

We have moggie new and mostly feature complete moggie tag commands now. Command documentation is available using moggie help command.

I think I'm going to close this issue as done-enough-for-now; this approach has served its purpose by giving me direction and structure for the basic moggie API, which has been very helpful.

If/when someone decides to actually try integrating moggie as a replacement for notmuch in one of the notmuch e-mail clients, we can deal with the bugs that come up at that point.