AST-1340 Extend idg cal
This MR adds three new idg-cal versions
- A simplified version that solves for scalar phase only.
- A version that solves for scalar phase only using the BFGS algorithm from scipy.optimize
- An extended version that mimics ddecal as it is used in the Rapthor pipeline, solving for a fast scalar phase with antenna constraint and a slow diagonal complex gain per antenna.
Edited by Bas van der Tol