Add widgests to enter a path in batchdialog.ui
Add a "Browse" button to batchdialog.ui
Obtain a path from a file dialog

- Assign this path as the lineEditPath's text.
- Change name of "pushButtonPath" to "buttonPath".
Ignore the path obtained in the settings file

- Use the path in lineEditPath instead.
Diable buttonStart if the path given is invalid