If the user passes a <path> argument to init, it is incorrect and a
bit confusing to reference the "current directory" or "this directory"
e.g. "run rad . in current directory" when the repo was not created in the
current directory and was created with a path argument instead.
Use the path provided by the user in help text, otherwise reference
the current directory.
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.