Various improvements

Backward-incompatible changes:

• acdh\arche\lib\RepoDb::getMetadataQuery() has been renamed to acdh\arche\lib\RepoDb::getMetadataStatement() and its return type has changed to PDOStatement

Other changes:

• Support for custom metadata read modes in form of {childrenDepth}_{parentsDepth}_{from}_{into} added.
• Support for limiting the set of fetched RDF properties added.
  • acdh\arche\lib\RepoResourceInterface::loadMetadata() and acdh\arche\lib\RepoResource::*Metadata*() methods take two additional optional parameters $resourceProperties and $relativesProperties allowing to specify the filtersl
  • acdh\arche\lib\SearchConfig has two additional properties $resourceProperties and $relativesProperties.
• acdh\arche\lib\RepoResource::delete() now returns a list of removed resource's URIs. This can be particularly useful in case of recursive removals.
• acdh\arche\lib\RepoDb::getPdoStatementBySqlQuery():
  • properly orders by numeric and date values;
  • generates new artificial triples providing the value used for ordering;
  • can now optionally skip generation of artificial triples (search match, order, search order value, etc.)
• acdh\arche\lib\SearchTerm:
  • TYPE_ID search triple type added for very fast search for a resource(s) with known internal repository IDs.
  • various fixes for multiple search values.