AST-1020 add getNeeds() to steps (2)
Add getNeeds() to BDAAverager, BDAExpander, DummyStep, IDGPredict, MSBDAWriter, PhaseShift, ScaleData, SetBeam, StationAdder, UVWFlagger, Upsample Also add it for a step with substeps: BdaDdeCal
Edited by Chiara Salvoni