Fix and test for bug #287
Added crude support for test result storage and comparison.
Clean up old test files.
Archive materials of old test framework
Test and fix (plus some support stuff) for #288
Fix and test for #291
Fix and test for #292
Fix and test for #293
Fix and test for #295
Update result file. State only added to POs if it exists now.
Tweak Playground for easier work with result files.
Added fix and test for #296
Test and fix for #299