Gk browser editing arrays

Makes it possible to 

*add or delete one or more object in a table
*create and insert one or more objects at selected rows in array
*remove one or more objects from array at selected rows
*ditto plus delete
*move one or more objects within an array by dragging

The created objects are filled with default values set in my code. Should probably check if defaults exist for the classes and use that when possible. The logic for letting the browser produce the default values is that the user might want to customise this, and the browser user might not have access to the model classes.

I know this is a big merge, but there isn't really any good way to split it into smaller merges. I will provide a  flow chart for the actions, since each interaction involves around half a dozen methods in 3 or 4 classes.
Strictly speaking, it is unnecessary, I could just call removeRowsInTableViewAtIndexes directly.

The reason for this structure is that there are a number of different operations that all require three or four steps, and most of the time the parallelism is complete, so I set up a flow that looks the same for all of the operations, even if it means a couple of methods that are pointless in themselves. I figured that this makes it much easier to follow, especially using the PDF flow chart I added.