new:
- csv files as input in assign ions tool
- adding new ions that were already included (=overwriting) works
- default json configuration files are created if the corresponding files do not exist
- protocol text more informative for adding/changing ions
bug fixed:
- bugs in calibrating, exporting
- legend not displayed in occupancy and charge plots
- in intact search: export dialog did not work
- in Info.py: peak values not properly displayed when changing/adding ions
- loading csv files did not work in some cases