et@0.0.3

Identify the et.rs port in --version output (ca7c581)

--version on every role (et, etserver, etterminal, htm, htmd) now
prints the et.rs identity and project URL:

et version 0.0.3 (et.rs)
A Rust port of Eternal Terminal
https://github.com/minpeter/et.rs

-V keeps the short upstream-compatible et version X.Y.Z line for scripts.
etterminal gains --version/-V support.