Table-based navigation/filtering

Implemented already, has to be ported to new xml:id format that encompasses series I and III 
```
MRP-3-0-01-0-YYYYMMDD-T-NNNN.xml
    ^- Serie
      ^- Abteilung
        ^-- Band
           ^- Teilband
```
where T = [A:'Protokolle anderer Provenienz', S:'Separatprotokoll', P:'Protokoll']