BibIndex: indexing only affected indexes
- Checks affected tags for every record, finds corresponding indexes and then reindexes only necessary indexes. (closes #1573)
- Moves function add_recIDs_by_date outside WordTable to make WordTable API more clear/simple.
- Changes in bibindex_regression_tests, new interface for helper functions.
Signed-off-by: Grzegorz Szpura <grzegorz.szpura@cern.ch>
Tested-by: Tibor Simko <tibor.simko@cern.ch>