Add more columns to list view

[dnsos]

At the moment we have title, main group, district, and amount. This leads to (seemingly) duplicates sometimes:

If we would add the columns oberfunktions_bezeichnung and funktions_bezeichnung the differences would become clear. However then we have to deal with space issues because we tend to have long values in these columns.

[dnsos]

Relates to #73

[dnsos]

1. Make sure that data for other attributes is returned, if not: select it
2. Render attributes in table, use CSS to make it look good on all screens