Remove OaipmhOpener because it resides in another package

See hbz/metafacture-core#2.
Update test data

See hbz/lobid#80.
Merge pull request #624 from lobid/move-OaiPmhOpener

Remove OaipmhOpener because it resides in another package
Merge pull request #625 from lobid/issue-lobid-80-extent-433

Update test data
Merge branch 'master' into issue359-noisPartOf
Update test data