AH related fixes

Load items from memory instead of DB.
Fixes rebuild command functionality for ahbot and sets expired auctions ignored from update process.
Discussed here https://github.com/TrinityCore/TrinityCore/pull/13440#issuecomment-60424579

Fix item suffix search Closes #9196

I added a comment here to explain the +60, but Im unsure of its actual function or if its needed at all