add django debug toolbar to development requirements
add select related to transactions list view (improve performance without an end)
add count of transactions and accounts to list templates
add settings for django debug toolbar to development settings file
simplify csv importer with get or create instead of check for exists and then create
add a function to account model to return current balance
reverse source and target in csv importer on negative values and so strip negative values from transactions themself
add balance to account list template
add list of incoming and outgoing transactions to account detail template
try to improve performance for account list view with selecting related