- Convert series number and instance number to integer in imageDetails.sortingInfo to sort the images properly (e.g. 1,2,10 instead of 1,10,2)
- Sort based on firstly instanceNumber, then seriesNumber, to show the first instance of the next series in the next viewport instead of the second instance of the previous series in multiple layout (other than 1x1)
- Do nothing when clicked if the previous and next stage buttons are disabled
- Add forgotten undefined check statements
