Update MWDL mapping

- Keep current mapping of search/creationdate since
  display/creationdate does not contain delimiters
- Map LINKS/linktorsrc to sourceResource/identifier
- Map facets/language to sourceResource/language
- Map display/lds17 to sourceResource/type
- Remove duplicate mapping of spatial, isPartOf, and dataProvider
- Update bulkSize in MWDL profile to 1000