To make it a bit easier to maintain multiple Shellfu/Bash libraries, we
want to have sort of "template" and keep every module as close to it as
practical.

Move satcmd to other repo and distribute saturnin as a stand-alone
shellfu library.  Users can import just the library instead of
embedding it inside their source tree, which enables them to delegate
part of the job to package manager.

...or,

> ...maintain "state of the art" templates by comparing with peer
> projects.

It's easier to maintain "state of the art" templates by comparing with
peer projects.

Useful for testing saturnin itself