TableView: Make sure that when rows are removed, blank row is still there

[#62270766]
Support multiple x properties in graph

[#62270766]
Provide example of graph with multiple X properties

[#62270766]
DataSet: differentiate model properties and non-model properties

[#64584962]

So e.g. streaming of data from model is related only to model properties.
Table: don't add empty row each time data set property is updated

[#64584962]

Add new row only if data set property is updated and this property
is bound to one of the columns.
Update table data format in "Radioactivity Model ..." interactive

[#64323488]