* system-tests: Add simple system test

* system-tests: Add tests

* system-tests: Cleanup

* system-tests: Cleanup

* system-tests: Do not depend on fixed file paths

* system-tests: Add test for RequestVersion

* system-tests: Add test for RequestRoots

* system-tests: Simplify test setup

* system-tests: Add cabal.project.local to .gitignore

* system-tests: Remove `unsafePerformIO`

`decodeClosure` works without it.

* system-tests: Extract C++ `trace` into separate file

Makes `stub.cpp` smaller and `trace` can be easier reused for debugging
purposes.

* system-tests: Add `save-one` path to `Test.hs`

One more option to play around...

* system-tests: Add test for RequestSavedObjects

* system-tests: Check result in test for RequestSavedObjects

* system-tests: Add test for RequestResume

* system-tests: Add test for RequestClosures

* system-tests: Add test for RequestInfoTables

* system-tests: Add test for RequestConstrDesc

* system-tests: Cleanup

* system-tests: Add test for RequestFindPtr

* system-tests: Cleanup

- Use RequestPoll where possible
- Better assertion for empty list
- Fail if synchronization times out

* system-tests: Remove unused test program (save-one)

* system-tests: Cleanup Server

* system-tests: HLint