* board, google_spreadsheet
Commit 8e0c7ccc77f358601b0701536fcb33842ca324a6 got rid of the
CompoundDomain class but did not adapt the code correctly.
- Domains have to be concatened, not regrouped in a big array
- String domains have to be converted to array
- "OR" joining must normalize subdomains first (add explicit "AND"s)