Miscellaneous minor issues

[hzovaro]

• [x] In example scripts/notebooks remove references to my own config files (is there a standard way to do this? I guess from command line args..)
• [ ] Is the A_V correction carried out if flux cuts are turned off?
• [x] Instead of running with and without cuts, perhaps save a copy of the DataFrame before apply_cuts is called?
• [x] There's a lot of boilerplate stuff in make_sami/hector/s7/etc._df() that could be replaced with a single generic function that is passed the appropriate _process_gals call from sami/hector/s7.py (see #48)
• [ ] Why are there cells where D4000 error < 0?
• [x] Remove all references to column x, y (pixels) as it's not really necessary and creates problems with object data types in DataFrames
• [x] Move cosmological parameters to config file
• [x] Updating default config parameters still doesn't seem to work properly in some scenarios
• [x] Figure out why SFRs aren't being calculated
• [x] Fix SFRs - nonzero SFRs in cells classified as 'not classified' but NaNs in those classified as SF
• [x] in compute_eline_luminosity and compute_continuum_luminosity remove the hard-coded factor of 1e16 - replace this with a flux_units arg and create flux_units entries for surveys in config.json
• [x] Also, pass the flux_units variable to the loader functions
• [x] Rename Extinction correction applied to correct_extinction
• [x] Silence warnings during metallicity calculations
• [x] Fix bug where missing_kinematics_cut wasn't being added to the DataFrame in add_columns()

Columns to rename:

• [x] Rename some emission line ratios to be less confusing, e.g. "log S2 ratio"
• [x] Rename x0_px --> x0 (pixels), etc. in all files
• [x] ~Dopita+2016 --> N2S2Ha~ Dopita+2016 refers to a specific polynomial form of the ratio so it doesn't make sense to do this
• [x] Rename HALPHA lambda_obs (component 1) (Å) --> HALPHA lambda_obs (Å) (component 1)

For renaming:

• [x] Find + replace all offending columns.
• [x] Run sami_regression_test.py. Modify it to print out which columns have changed (& double-check that assertion tests still work).
• [x] Overwrite reference DataFrames.
• [x] Once everything is fixed, write a script for loading & renaming columns in the full-sized DataFrames rather than making them again from scratch.
• [x] Modify keys in local config files as appropriate.
• [x] Double-check that example notebooks still run.

[n-keerthi-gayathri]

@hzovaro i would like to try, please assign me this issue

[hzovaro]

Sorry @n-keerthi-gayathri, I can't see anything in your profile that suggests you are familiar with integral field unit data sets - I would prefer for someone familiar with handling this sort of data to contribute.