Ajax communication message formatting

[woutgg]

The current comma-separated values are rather restrictive. Json is more versatile (e.g. key/value pairs) and handles quotation and related issues out of the box.

At the very least, the current format should be extended with key/value fields.

[peteruithoven]

@woutgg Do you remember which messages you where referring to here? The API is all in json.

[woutgg]

I think it was about the initial message formatting. csv was refactored to json in this commit, introducing use of serializeAsJson(). Closing this one.

[peteruithoven]

Thanks for the clarification