Fix the Audi import file issues

There is a need to fix the following issues:
1-An expection is thrown when 2 trxn are found for one account in one file, and where one of them would close the account. The second is not thrown as overpayment.
2-Also the file cannot import decimals.
3-We would like the file not to import to group client accounts. Only group and individual accounts transactions should be possible to import. The proper validation message should appear when the group client accounts transactions are imported.