GUI: fixed crashes when rerun jobs with 2D reference data
This resolves #191 (closed). This resolves #192 (closed).
I reverted commit e87de6bc which linked job Activity with job Presentation. With this "link" if user set activity to "Job View Activity", presentation to "Fit 2D Data" and run the job, he gets a crash. Without this, user can choose activity and presentation independently.
Edited by Mikhail Svechnikov