allow configuration of the fields returned by the query

* defaults to blank
* can be pre populated using TypoScript setting dataFields.default
* can be set from dataFields argument in URL
* can restrict to explicit set using TypoScript setting dataFields.allow
* can disallow specific fields using TypoScript setting dataFields.disallow
germania-sacra: only load minimal fields for nearby monasteries

used the new dataFields arguments
cleanup
germania-sacra: do not display standort.bemerkung