update dspace test files
adapt to current Solr field naming:

* repo in the dc. namespace
* only pass on dc. fields
* remove special cases for uri / hasfilename / hasfileuri
DSpace to MARC: fix date issued field
DSpace to MARC: do not use subtype
DSpace to MARC: improve thesis handling
DSpace to MARC: turn line breaks into spaces

no more pilcrows as line breaks are not always used to separate paragraphs