Score calculation data element

[smpadhy]

Currently, while previewing the form, the fields that needs to be calculated based on the previous fields values are also shown without any indication that they needs to be calculated and the dependency structure. We need some attributes to indicate the dependency structure. As per Hauke's presentation, we could store score calculations or any transform in separately and then can use a graphical workflow interface to specify the score calculation on a group of fields. We need more discussion to come up with the model.