a few imprvmts to dpla fxns, rebuilt main pages with new roxygen2 ver
added two europeana fxns
updated man files for new roxygen2 ver
added man files for eu_ fxns
many updates
updated dpla_ fxns a bit
changed all fxns that work with oai-pmh endpoints to prefixed with md_
removed datacite dc_ fxns and microsft acd res fxn to inst/ignore folder