Detector window now shows two peak collections
Resolves #197 (closed)
This merge request implements three new features in order to enable comparing peak collections on the detector view pre- and post-refinement.
- Cloning a peak collection: from the "Experiment" tab, under "Peaks", click on the "+" icon, and select the "clone peak collection" option. This will do a deep copy of the collection.
- A second peak table in the detector window. Shows info for all peaks in the second collection being visualised.
- Plotting two peak collections simultaneously on the detector window. The second is empty by default.