Initial import of VZG module. This module will contain all code
that is specific for *ALL* GBV VuFInd installations. For example
customizations in record drivers for findex.gbv.de or the PAIA
driver (though that might move to upstream VuFind in the future).

All code specific for single VuFind deployments *HAS TO GO INTO IT'S
OWN MODULE*
bug fixes: cancel reserves, renew loans
Merge branch 'master' of https://github.com/vufind-org/vufind
VuFind 2.3

Merge branch 'master' of https://github.com/vufind-org/vufind