Standardized FITS format

[aymgal]

More practical would be to have all "external" FITS files to be merged into a single one, which would always follow the same structure. That would simplify sharing and automation.
In particular, the unique FITS should contain various HDUs such as:

• the data
• the noise map, or exposure map, etc.
• the PSF
• 2d images of the lens potential, deflection angles, kappa, gammas
• the source model