BibRank: fix incremental citation indexer leaks

• Fixes some incremental citation indexer leaks by forcing citation-indexing of all records that cite or refer to the records modified since the last run. (closes #917)

• Also, do not update citation dictionaries into the DB during runtime, since if we process firstly all report numbers and only then all journal information, it could temporarily show bad results to users due to incomplete citation dictionary. Update citation dictionaries only when we are fully finished.