Ergonomy improvement : input datapoint properties at the same place as datapoint creation

[nduvernois]

When you input "a certain quantity" of datapoints, you feel released when you are done with the list, until you realise that you also need to go to "datapoint properties" and edit again the same list of datapoints.

Suggested improvement : in the datasource screen, when a new datapoint is added, include the possibility to edit the datapoint properties (numerical format, physical unit, precision, storage duration, and so on...)