Transforms exported SQLite database of the mobile app SettleUp for a chosen group into CSV for evaluating tracked expenses. Outputs a CSV on stdout that has one row per payment and the following columns:

1. purpose of payment
2. date of payment
3. full monetary amount of payment in output currency (chosen by --currency)
4. one column for each member associated with this group, detailing his share of the payment amount

• adds up split payments
• considers uneven payment splits
• the output currency can be chose, but must be one of the currencies available in the app

usage: stats.py [-h] --sqlite-file SQLITE_FILE --group-name GROUP_NAME
                --currency CURRENCY

arguments:
  --sqlite-file SQLITE_FILE
                        the sqlite file that was exported from SettleUp
  --group-name GROUP_NAME
                        the name of the SettleUp group that shall be regarded
  --currency CURRENCY   the currency code for the monetary amounts in the
                        output CSV