Add support for common directories for artifacts. Merge JUnit files.
We now have common directories for the artifacts produced, the logs we generate and the environment files that we use. These fixed directories mean that an automation system can more readily rely on the locations provided. We have a tidier mechanism for reporting the results in XML, by writing multiple files, and then merging them. We could still do a lot more with this, but it works pretty well right now. This change covers all the components, but it has only been tested with the Python code really.
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