Indicate when transformed symbols have contradictions

[taesungh]

Another feature that is not yet implemented is showing when transformed symbols have contradictions and what features are contradicting. In practice, this should be relevant only for transformed symbols that have an unknown label. As noted in #12, there is a button shown in the spreadsheet table for such symbols. The color of the button can be changed to indicate when there are contradictions, and there could be a Tooltip describing the contradictions, similar to the one in the InventoryTable when a diacritic cannot be applied.