Adding new STIS notebook Low_Count_Uncertainties.ipynb

[Jackie-Brown]

Added STIS notebook Low_Count_Uncertainties.ipynb, requirements.txt, and pre-requirements.sh

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[haticekaratay]

@Jackie-Brown ,
I ran this notebook locally and encountered the same error as reported on the CI.

[haticekaratay]

@Jackie-Brown , another important thing to note is that we are getting a deprecation warning for these two. The notebook will fail when new releases are out.

UserWarning: GFIT is deprecated - stsci.tools v 3.4.12 is the last version to contain it.Use astropy.modeling instead.
  warnings.warn("GFIT is deprecated - stsci.tools v 3.4.12 is the last version to contain it."
UserWarning: NMPFIT is deprecated - stsci.tools v 3.5 is the last version to contain it.
  warnings.warn("NMPFIT is deprecated - stsci.tools v 3.5 is the last version to contain it.")

[sean-lockwood]

The notebook is calling crds in the Unix shell, but that package is not in the requirements file:

!crds bestrefs --update-bestrefs --sync-references=1 --files ./mastDownload/HST/obgh07020/obgh07020_raw.fits

I believe the Unix call is silently failing because the crds executable cannot be found.

[Jackie-Brown]

@haticekaratay I took a look at the depreciation warning for NMPFIT and GFIT, and the notebook doesn't use either of these. Will the notebook still fail when the new version of stsci.tools is out? Otherwise the notebook looks ready to publish unless you have any other concerns

[haticekaratay]

@haticekaratay I took a look at the depreciation warning for NMPFIT and GFIT, and the notebook doesn't use either of these. Will the notebook still fail when the new version of stsci.tools is out? Otherwise the notebook looks ready to publish unless you have any other concerns

@Jackie-Brown, I will take a look, as it's been a while, and submit my review here this week.

[sean-lockwood]

@Jackie-Brown @haticekaratay -
Those are known deprecation warnings when importing stistools for now.