BibIndex: indexing non-MARC standards
- Introduces NonMarcTermCollector for acquiring data from non-MARC records.
- Adds new column to tag table and inserts corresponding RecJson fields as another non-MARC value for 'tag'.
- Enhances test suite acordingly.
Signed-off-by: Grzegorz Szpura <grzegorz.szpura@cern.ch>
Tested-by: Tibor Simko <tibor.simko@cern.ch>