Add indicator b of field 599 to be dct:isPartOf, see #491

* update test
Merge branch 'master' into issue-491-isPartOf

Conflicts:
	lodmill-rd/src/test/resources/hbz01XmlClobs.tar.bz2
Merge pull request #496 from lobid/issue-491-isPartOf

Add indicator b of field 599 to be dct:isPartOf, see #491