EST-352: Reorganising some fixtures
EST-349: Add description to tax import
EST-354: Create index on import, values will be added later using Excel upload
EST-340: Add fields for tax register. These could move to a separate entity after the data is normalised.
EST-356: Remove "Collected" as an invoice status, having a collection number already indicates that an invoice is collected
EST-357: Ignore terms with invalid intervals
EST-358: Fix error on fixed invoicing frequency
EST-310: Turnover Rent can be invoiced in advance. Some refactoring of layouts and removing unused imports
EST-351: Indexation cannot be negative