-upgraded string formatting to python3 format() method
-increased precision to 8 decimals
-clearing all snapshots when adding mode volume snapshots (should be temporary, but easier for current workflow at the moment)
added error handling when plotting frequency snapshots not in .inp file
Some improvements to plotSnapshot:
-Comment formatting
-Added handles.UseAdaptedMaxIfIsNaN and handles.symmetricRange to have more control over range setting.
-Added handling of error when the snapshot-related data could not be found in the .inp file.
-Simplified/improved parts of code related to setting minval/maxval
-Reduced duplicated code related to extracting snapshot-related data.
minor fixes + restructuring
-Added checkboxes for the new snapshot range options
-Added a lot more widgets for potential future options (unless Matlab-free alternative gets done first...)
-fixed bug when loading object with less columns then before
-added error handling for energy snapshot option
-minor debug output changes