Streamline tests

Tests right now are much slower than they should be, which also means that running them is turning into a much bigger hassle than it should be. Here are some things to do in order to make them quicker

1) Remove OO vs non-OO tests unless behavior is known to differ:

Right now all our OO functions and non-OO functions traverse exactly the same code paths (not as previously when there would be different code paths for each).

2) Move slow tests into their own categories: Simple mutation functions should not be intermixed with long things like key durability ops. These should be in separate files -- thus also allowing us to exclude them somehow (either via make test, or through runwrap/phpunit)

3) Tests which are expected to fail or are inconclusive should be marked as such.