Finished conversions:
 - Telescope.py -> most of the /models/ directory, and model_defaults.py
 - phot_compute_snr.py -> methods in the new Camera class
 - get_pysynphot_spectra.py -> added /spectra/ directory, and became spec_defaults.py
 - coron_model.py -> coron.py in /models/


Not yet converted:
 - exoearth_vis_bokeh0.12.py
 - mosview_bokeh0.12.py
 - phot_etc_bokeh0.12.py
 - planet_atm_bokeh0.12.py
 - spec_etc_bokeh0.12.py
 - z2gal_bokeh0.12.py
 - coron_model.py ->  to bokeh_coronagraph.py in /interface/

Not going to be converted:
 - coronagraph-master (this is someone else’s package)
 - save_file.py (looks like it was absorbed by coron_model.py)
