Remove the old testing directory to make room for the submodule.
Add test-manager as a submodule.
Pull from upstream.
Update the test running procedure: the load file just defines the
tests, and leaves triggering actual execution to the caller.
This comment is irrelevant.
Hide the tests in the test/ directory, as is my habit now.
Rename load-probscheme to load, as is my habit now.
Keeping track of where things are.