Expose few more base functions
Add (failing) tests

My basic Makefile still continue to work fine.
Tests are still falling, but now at least there is way to understand why
Tests are still broken, but the debug output is nicer at least
All the current tests pass!
Add a (failing) test for key serialization
Improve pretty-printing of key sets
Fix serialization of keys.

All tests pass again.
More failing tests
Fix failing tests
Cosmetic changes
Refactor the tests a little bit
Fix compilation of IrminQueue
Fix disk tag tests
Improve test display
Refactoring of test_common
Use the right debug functions in IrminQueue
Add (failing) test for IrminQueue
Redirect test outputs to a file, display the full stack in case of errors
Always run the test with vebose enabled (even if the env variable is not set)