Ask scatterplot to return the record ids of each point

[asizemore]

This feature will be useful for highlighting a specific point in a scatterplot. Relies on VEuPathDB/plot.data#264

Status:

• successful response!
• need to add api and ensure normal scatters are not getting the extra ids back.

[bobular]

I know this is a draft, but is the scatterplot endpoint always going to return point IDs?

Or will the endpoint receive a new config parameter?

[asizemore]

The endpoint now has a new config parameter called returnPointIds. It defaults to FALSE because we don't want them for most scatterplots right now