Nice to have: Some kind of namespacing

[yannk]

It would be nice if you could say: stop all and really mean stop all in 'test' when you are in a 'test' context.

You would for instance declare services with a namespace. the current namespace would come from the current environment and would reflect in the different default parameters of the usual commands.

It would also facilitate clean-up procedures. For instance in a unit test, you can make sure that the namespace unittest is purged once the tests have run.