Merge remote-tracking branch 'origin/feature/holdings-rest' into feature/holdings-rest
* Added support for holding items functions
* Set availability timeout to 3s
* Replaced usage of localid with bibsysnumber
* Added parameter to disable item extension
* Added sequence number to item data
* Added loading mask for popup
* Added loading mask jquery plugin
* Changed holdings items popup link handling
* Bugfix: Prevent php error which causes a long running script
Merge branch 'development' into feature/holdings-rest
* Set popup title (record title)
* Fixed styling