Enhance testsuite to allow both run and walk modes

[joern]

Safari fails miserable to complete the current testsuite: It just crashes. To use the testsuite for safari testing, a "walk" mode is necessary: Run only one test when clicking a button or whatever.

Buttons/icons design could imitate Selenium.

And considering the pretty stable jQuery core, it makes sense to upgrade the testrunner to fully use jQuery itself, reducing problems already handled by jQuery.

Maybe add a "selftest" to ensure that the testsuite can run properly, that is, test all needed jQuery funcitonality before relying on them.

[joern]

Testsuite now allows you to run a single test. Won't help with Safari, but at least its possible to run a single test a time by doubleclicking on its title (after running the complete suite).