LORLS-5.1

Jon writes: "Another update to the Loughborough Online Reading List System (LORLS). Changes include the tagged-ref-import script omitted previously, also some fixes for tagged reference (specifically RefWorks) import and export. Fixed modcode suggestions if a user tries to create a new module with a code that already exists. MARC.pm now used to decode the records supplied by Z39.50 (including ones with local control numbers and no real ISBN/ISSNs or multiple ISSN/ISBNs). Displaylist now does caseless matching of stages/dept codes as we had some instances of lists "invisible" to browsing because of incorrect case for these. Added some extra indexes as suggested by Ben Charlton."