#2 Support for parallel execution of tests

[Henrik Kaipe]

As of now the testruns that are produced by a CallbackParams test-class are run one at a time. It would be nice if it was possible to execute testruns in parallel, however, and with the current trends toward multi-core CPUs it could allow the test-suite to complete much faster.

Since CallbackParams already creates a separate class-loader for the testruns it would probably not be too hard to make each test-thread run its allotted testruns on its own exclusive class-loader in order to achieve a pretty good thread-safety with little effort for the test-developer.