It didn't make sense to get eg. `Patch failed` when listing patches
failed. We change all fatal errors to simply "Error:", giving more
control over the individual commands.
This is a fairly substantial change, which adds a new configuration file
to the user's `$RAD_HOME` that includes node configuration, including
the alias, and also makes node aliases required.
When running `rad auth`, the user is now prompted for an alias, which
defaults to `$USER`.
When running `rad self`, the alias is now shown.
If the user runs radicle without a config file, the defaults are loaded,
and `$USER` is used as the alias.
cloudhead
Alexis Sellier