--instance parameter is confusing

[craigmaloney]

If you pass the --instance parameter on an already-configured tootstream (eg: with a default configuration block) tootstream will cheerfully ignore the parameter and load up the default instance. This parameter will only work if you add the --profile parameter, and even then I believe it will check if the profile is present and use that profile's instance configuration instead.

Of course the downside is if you pass --instance without a profile and it uses the instance parameter instead of the configuration file's instance then you could potentially try logging in with the wrong credentials.

Not sure what the best way to handle this is but it makes --instance only useful in one case (logging in to a new instance with no associated profile in the configuration).