display 'decouvert autorisé' in balance chart
My bank allows me to have a balance down to a given (negative) treshold for free. But when the balance is even more negative, it costs me. The fees are taken on my account later. I would like to be able to counter check my past balance against this treshold 'in the past'. Which means:
- allow to define a treshold for each account
- draw a flat value on the balance chart
- change the color of the balance plot when the balance is lower than the treshold (if possible, color in red between the balance and the treshold)
- by default, use this treshold for balance alerts