Adjusted code for 2.1.
Fixing things up so it basically works with 2.1.
UI for turning parallel on/off.
Reporting results to Sauce works agan.
Completion of parallel run now correctly detected.
Progress bars in the parallel playback list.
Fixed issue where single test playback did not display correctly when parallel was enabled.
Respect separate parallel limit for Macs.
Work on stopping parallel playback correctly.
Fixed issues with wrong info displayed during Sel1 parallel playback.
Changed behaviour of Mac concurrency limit to reflect reality.
Fixed bug where the wrong playback system would be selected.
Merged branch for Builder 2.1.