The standalone python script make4FGLxml.py has been replaced with the new python package LATSourceModel.
This new package represents a rework of the code to be cleaner, modular, better documented, and more efficient 
while also adding new functionality.

Due to the refactoring of the code into several files/modules, it is now served 
via the python package index and installable via pip:
pip install LATSourceModel

[NOTE: the code now uses the pandas module, which will be installed at the same time if it is not already]

The main documentation on usage and other aspects is:
https://github.com/physicsranger/make4FGLxml/blob/main/README.md

The change in usage is largely confined to the new module name, some changes in argument names, and no longer
needing to add the .py extension when calling make4FGLxml from the command line.  The GitHub readme outlines
the changes, standard usage, and details new features.  Here, we will make note of the most important details for 
those users already familiar with the previous script.
 - the main class has changed from srcList to SourceList, this means that instead of:
        from make4FGLxml import srcList
    the user should modify scripts to be:
        from LATSourceModel import SourceList

 - when creating the SourceList object, the names of the arguments have changed:
        old: source_list=srcList(sources='gll_psc_v31.fit',ft1='myevents.fits',out='mymodel.xml',DRversion=3)
        new: source_list=SourceList(catalog_file='gll_psc_v31.fit',ROI='myevents.fits',output_name='mymodel.xml',DR=3)

            [NOTE: the ROI argument can be the path to a LAT event file OR a list with the details of the region of interest,                      e.g., ROI=[123.45,-12.345,15], which would tell the code to center the ROI at (RA,DEC) = (123.45,-12.345) with a 
              selection radius of 15 degrees]

    - when calling the make_model method, many of the argument names have changed to be more descriptive, but the
      order of the arguments has (almost) not changed, the changes are:
               GDfile -> galactic_file
               GDname -> galactic_name
               ISOfile -> isotropic_file
               ISOname -> isotropic_name
               normsOnly -> norms_free_only
               extDir -> extended_directory
               radLim -> free_radius
               maxRad -> max_free_radius
               ExtraRad -> extra_radius
               sigFree -> sigma_to_free
               varFree -> variable_free
               psForce -> force_point_sources
               E2CAT -> extended_catalog_names
               makeRegion -> make_region
               [a new argument has been inserted here, region_file, allowing the user to explicitly provide a name 
                 for the .reg file]
               GIndexFree -> galactic_index_free
               [the argument wd -> write_directory and has been moved to the SourceList initialization]
               oldNames -> use_old_names

When you install the LATSourceModel package, pip automatically generates an executable in the path (you'll 
have to open a new terminal to use it) called make4FGLxml which has very similar behavior to the previous
make4FGLxml.py script.  The full argument names match the new names above.  Use make4FGLxml --help for more
information and/or see the readme.

The LATSourceModel package now includes functionality to add sources to an existing LAT source model, with all
spatial and spectral models listed on the FSSC implemented.  The command line tool, make4FGLxml, has to option
to add a single, non-4FGL point source to the model.  See the GitHup repo readme for more details.

Please report all issues on the GitHub repo issues page:
https://github.com/physicsranger/make4FGLxml/issues