Make writing of outlinks in WARC metadata records optional
We have added the parameters settings.harvester.harvesting.heritrix.warc.writeMetadataOutlinks and
settings.harvester.harvesting.heritrix3.warc.writeMetadataOutlinks so the parameter can be in both <heritrix> or <heritrix3> tags.
NAS-2716Make overriding of writeRequests, writeMetadata, writeMetadataOutlinks, writeRevisitForIdenticalDigests and writeRevisitForNotModified optional