Fixed issue with empty string in proxy settings
Fixed minor stuff with timers and un-used variables
Fixed debt object id
Added support for ding_session_cache in getting user status
Fixed reservation caching
Fixed caching of user loan list
Removed the HTML code from availability and match output to ding_availability
Added 12 mounts to interest periode
Fixed counters in holdings information
Added holdings information cache
Added reservation type to reservation to have more information in ding_reservation lists
Updated populate issues to match new data format
Fixed undefined index with year books
Fixed undefined index in reservation list
Resolved merge conflict