Spec for helper method

I don't know why this wasn't committed last week for [#37445673]. This is a partial spec for the helper method which determines which activity is currently being worked on.
Merge branch 'table-xy-labels'
Note on a command-line warning
Create DataSets for SensorGraphPanes, too

[#37551441] If SensorGraphPanes don't have DataSets (even empty ones) it causes trouble down the line...
Bring smartgraphs-runtime up to multiple-data-sets tag