Previously not accumulating total amount of balance across all account.
Also added fiat getter from dashaboard

Move them down to Account class. This creates a "bubble" to hold the same calculation formula for future caching if necessary.
On the other hand, every child that inherts Account and reuses the price_precision and qty_precision should override the value according to the symbol/pair. Following this line, e.g. Bots have different content for each instance, so symbol/pair changes every time. Deals, however, keep the same symbol for the whole transaction.