Would it be possible to add custom fields to one's collection?
Let me explain better: when I add a coin or banknote, I like to include information such as the origin of the item, its physical location in my inventory, and, for banknotes, sometimes the serial number. These fields are definitely a specific need of mine, but others might have their own needs.
I would like to be able to define, for example, a 'serial number' field for banknotes, and when I add a new banknote, this field would appear among the ones to be filled in.
