#70 auto flag failed tests for retest

[healdem]

usign the addin. it would be 'nice' to have the ability to automatically select tests which failed so that retesting is only performed on the failed tests. I have some test fixtures running to several hundred tests and its a pain to go through each one fixture and unselect the tests that have passed. I think waht I'm aiming at is a simople mechanism to filter out passed tests so I can concentrate on clearing up tests which still fail. natch the final test before signoff should be to retest the whole module/test fixture