Use RPB Spatial notation in SKOS

[acka47]

Moved here from hbz/lobid-vocabs#228

At the moment the SKOS notation for RPB Spatial is not used. Should we put them in the SKOS File too? To reduce the confusion in communication with LBZ.

To also document the difference between o and not o concepts in spatial?

<datafield tag="084" ind1=" " ind2=" ">
  <subfield code="a">rpbr_01_</subfield>
  <subfield code="2">rpb</subfield>
</datafield>

=> https://rpb.lobid.org/spatial#n01

:n01 a skos:Concept ;
    skos:broader :n1 ;
    skos:closeMatch <http://d-nb.info/gnd/4049795-1> ;
    skos:definition "Rheinland-Pfalz insgesamt. Landesteile (n1) > Rheinland-Pfalz (n01)"@de ;
    skos:inScheme <https://rpb.lobid.org/spatial> ;
    skos:notation "01" ;
    skos:prefLabel "Rheinland-Pfalz"@de .

``

rpbr_99_o13802_ rpb ```

=> https://rpb.lobid.org/spatial#n13802

:n13802 a skos:Concept ;
    skos:broader :n138 ;
    skos:definition "Einzelne Landkreise, Verbandsgemeinden, Orte und Ortsteile (n6) > Neuwied, Landkreis (n138) > Bad Hönningen, Verbandsgemeinde (n13802)"@de ;
    skos:inScheme <https://rpb.lobid.org/spatial> ;
    skos:notation "o13802" ;
    skos:prefLabel "Bad Hönningen, Verbandsgemeinde"@de .