Grouped Work fixes
Add primary identifiers for grouped works to a different table for faster lookup
Fix check digit calculation when converting ISBN 10 to ISBN 13
Cleanup unused code
Fix typo processing Grouped Works
Update record grouping to use primary identifiers table
Make Ratings data more generic
Load Ratings using new Grouped Work API to allow the data to be accessed from multiple locations
Add code to load primary identifiers into VuFind
Fixes for placing holds when logged out
Work on updating (ils) record display to be more similar to Grouped Work