Handling of self / inplace is broken

[richfitz]

The inplace: false idea (default for projects) clones the project into a directory self with the idea that the project will have a fresh clone to work with.

• The name / idea is not very clear
• There's no obvious way of recloning and that should probably be done at launch time
• The launch commands generated by dockertest don't point the working directory there
• If they did, then output would be at risk of being obliterated by a reclone