in updatePoints, when we are deleting points, we have to follow the pattern laid out in PlotLayer:dataDidChange. And this pattern changed with the layer manager but didn't get changed here.
Merge branch 'master' of https://github.com/concord-consortium/codap
Build 0248
Patch XHR requests to allow sending cookies/credentials
Allow setting a document server location through url params
Automatically handle "logging in" when using a document server

[#72554506]
Better user interaction when a user loads codap directly and hasn't logged in to the document server

[#72554506]
Better url for managing documents when using a document server
Re-enable guest login while using a document server

[#72367218]
Allow setting the "shared" flag if we're using a document server
Add a "Share Document..." menu item

[#72368142]
Disable all logging when using a document server.

For now, at least.

[#72366706]