Bad pixels from darks -- Input slope files

[bhilbert4]

We should update the code such that it can use 0_ramp_fit or 1_ramp_fit files. This will make it easier for people who have exposures containing a single integration, where the pipeline (may not?) output a 1_ramp_fit file. I think the file format of the 0_ramp_fit and 1_ramp_fit files are the same. I think the only difference is the dimensionality of the data.

Perhaps it would be worth adding a check that the NINT header keyword is equal to 1 if the user attempts to use 0_ramp_fit files.

@KevinVolkSTScI and @bsunnquist made updates to the code to get it to work with their files. Are your updates generic enough that they can be applied to all instruments?

[KevinVolkSTScI]

My code changes are not specific to an instrument. They should work for NIRSpec as well as for NIRISS. I will try to post the changes today or tomorrow morning, but I have other pressing issues right now so there is some chance it will take longer.

[bsunnquist]

Mine were specific to nircam, but all I had to do was change the filenames in a few places, so would be easy to generalize

[jemorrison]

My intention was if someone did not have 1_ramp.fits files it would by default look at 0_ramp.fits files.
I must of done something wrong. Bryan take a look at the module 'read_slope_integrations'
that is where I tried to do this. Maybe you can easily see what I did wrong.