Improve error handling

INSTALLING: Add missing cargo-deb requirement

Tweak the manpage

Add a TODO about buffering

Uppercase the manpage title

List some desirable features

Add some installation instructions

Use "cargo run" to build the docs

This sidesteps the bootstrapping issue.

Remove debugging traces

Stub out the docs if flin isn't installed

Dogfood the docs

Rename again

Link to bugtracker

Change name; add README

Initial commit