Look at description to better match look-alike transaction

[michielbdejong]

If Alice sends 5 EUR to Bob for 'shirt' and then on the same date also sense 5 EUR to Bob for 'socks', then with the code from fdbd56f#diff-e509e05dc2597e583f216d44a332e01e301f1bd2b5938b2dea2764beca5dcbc0R56 there is a 50% chance that they get mismatched (in fact, they'll get matched based on the order in which they occur in the MT940 statement).

Should use the description field to help disambiguate.