- Add license headers to source files (years based on commit dates)
in `src/test` as well as `qa`
- Add `README.md` to `src/test/data` specifying MIT license
Fixes#3848
Re-organize the pull-tester scripts a bit.
And disables running the blockchain tester, it is not working properly
on the pull-tester machine for reasons I cannot explain (fails to start).