amounts to integers

[finnharbeke]

floating points are inprecise!

[finnharbeke]

todos to make that reality:

• shut down server
• change models to have integer amounts and starting saldos etc
• check changes functions if it works with floats
• probably let backend frontend communication be in integers
• frontend function taking currency and integer to fixed string and the other way round

sql:

• alter table table_name rename column amount to oldAmount
• alter table table_name add amount integer default 0
• update table_name set amount = round(100 * oldAmount) where currency_id = 1