Implement fetchMoreData() if Required

[Daniel Marsh-Patrick]

Custom visuals typically have a fixed limit on the number of rows, but recent changes in the API gives us a mechanism to request up to 100MB of data from our model if there's a ton of data points.

We should test with a sufficiently large data model and get this working, as violin/box plots typically work with a lot of data.

[Daniel Marsh-Patrick]

In starting this, I've observed that the way we're grouping creates a lot of erroneous values, so we're still not doing this right, despite reworking it. the better way would be to group by sampling, then category to keep the grain down, so we'll start with this and see what we can then do with windowing the data etc.

[Daniel Marsh-Patrick]

As per this thread, the feature doesn't work in the debug visual, but it does work when compiled into desktop.

[Daniel Marsh-Patrick]

Running in desktop produces a number of errors and gets me stuck in an infinite loop of alert boxes, despite the additional data coming in.

This appears to be broken in API versions 2.1 and 2.2 but working in 1.13. I don't see a bug report for this, so I'll try and raise one when I get time.

Have downgraded to 1.13, as I was only staying current for the sake of performance reasons, but I'd rather have a functioning feature :P

[Daniel Marsh-Patrick]

Initial tests are successful, so resolving.