Loans migrator should "remember" inactive users and keep them active for loans migration #943
Description
The largest loan files often include huge numbers of items checked out to inactive users -- reactivating the same users over and over is time consuming.
Desirable behavior would be to analyze loan file before processing and deactivate user only once. This could be done either by tracking processed vs total loans per user barcode or by sorting file by user barcode before starting migration process. Some minor complications are introduced for interrupted processes, but I'd expect dramatic speed gains when processing tens or hundreds of thousands of loans