Support very large libraries

[Floppy]

I thought I had a load of stuff, but some people have a LOT more.

This ticket collects together a few tickets that relate to mangement and utility for very large libraries.

• [ ] #2084
• [x] #2419
• [ ] #2362
• [x] #2546
• [ ] #2295
• [ ] #2585
• [ ] #2618
• [x] #2630
• [x] #2142
• [x] #2946