vifanord: configure BSB Osteuropasammlung
vifanord: improve estonian configuration

* pre-configure jrnl database
* fix error in tallinn URL
vifanord-zsql: remove incorrect comment
strip medium information from BSB records

* it seems to be mostly wrong (books come through as images (nkm), microforms as books, …?) so better go unknown
se-kb: remove superfluous 2=102 configuration
gbv: add left-out »x« prefixes for Pica index names in stabikat
introduce corporate and meeting fields

* add field with attributes to tmarc.xsl
* serve it in brief records