Update `install` to work with the new `remote_configuration` feature, which, in case of `install`, is local instead of remote.
flake8 happyness.
Simplify the usability tests.
Implement a `LocalConfiguration` class, API-compatible with `RemoteConfiguration`. It doesn't use fabric at all and is used for `localhost` only. This makes `1nstall` and `pkgmgr` work again, and is totally transparent in case `localhost` is part of a `fabric` host list.
Just a commented out debug message, in case.
Merge branch 'release/1.3.3'
Merge tag 'sparks-1.3.3' into develop

1.3.3