remove leftover comment
make configuration more generic and readable

* introduce target IDs other than their URLs
	* can be stable even when the URL changes (for use in localised display strings)
	* shorter
	* more readable
* use this to make a few settings a bit simpler / more generic
vifanord: move custom metadata collection to its own file

inserted with XInclude in all services _before_ the default configuration
group / clean up default metadata configuration
vifanord: move OLC Osteuropa configuration
gbv-sru: improve line breaks
gbv.sru: fix Pica index name for geo DDC
gbv-sru: configure Stabi Berlin search as GVK + bib 0001
vifanord: switch Stabi Berlin search to GVK variant
vifanord-zsql: fix typo in target ID
default metadata: small cleanup
configure limitmaps

* in central metadata
* remove old configuration in targets
yaz 5.0.18 / pazpar2 1.6.39
improve creation of Pica parent links

now re-build the URL completely to ensure we can also handle extra parameters
replace leftover old URLs with new vifanord-sql target ID
include vifanord-general settings file in all vifanord services
update pazpar2-etc with tmarc.xsl changes