Limiting Case Improvements:
1) if no PSF, and all Point sources, pixel fluxes will be produced
2) Improved efficiency of Catalogue Read
3) Added options for user defined catalogue column labels
4) Added checks to stop crash when no skypixels are present in bins during sky estimation
5) Added ability to supply a Weightmap with Zero point that can be used to create the image mask when no image mask is supplied
6) Added new parameters to parameter file creation and read