Added default root directory

 Added default root directory for tests, and altered dashLauncher.py to use it instead of the previous local path.

But I'm getting an error:

```bash
QQmlApplicationEngine failed to load component
file:///C:/Users/marcus/Dropbox/AF/development/marcus/pipi/repos/guilab/dash/dash.qml:114 Type MillerColumn unavailable
file:///C:/Users/marcus/Dropbox/AF/development/marcus/pipi/repos/guilab/miller/MillerColumn.qml:-1 File name case mismatch

Traceback (most recent call last):
  File "C:\Users\marcus\Dropbox\AF\development\marcus\pipi\repos\guilab\dash\dashLauncher.py", line 110, in <module>
    window = engine.rootObjects()[0]
IndexError: list index out of range
```