adding DRAGONS version to header of outputs

[olyoberdorf]

In _write_final, if we are saving an output file, add a header keyword recording the version of DRAGONS used

[KathleenLabrie]

This will be added only at the end of the recipe. What about when I do writeOutputs() ? What about intermediate products that some primitives create?

I don't actually have a solution. We don't want to add this to astrodata since we plan to split it out. Having recipe_system control it makes sense but I don't know when to add it.

Let's think ahead...

The versions that matter are the version of recipe_system (a bit) but mostly the version of geminidr. Think of the use where a third-party package, say maroonxdr, is used. We need that version number too. It will use geminidr and maroonxdr, and "dragons". geminidr can be DRGNSVER, I don't see splitting geminidr out of DRAGONS anytime soon. Yet, I'd like to have a mechanism that would allow the external packages to add their version number too.
In the prepare primitive? Some setVersion primitive? I'd like to get Chris' opinion on this.

[KathleenLabrie]

Another worry I have is what happens with this PR implementation when I do reduce -r display which does not change the data and therefore does not write an output. I should not. Will adding that header by default suddenly "change the file" and then force an output to be written?

[olyoberdorf]

writeOutputs would work as well, but I really defer to you and Chris where this would best live. In the _write_final, it is only saving the file if the filename changed, or a suitable suffix has been set.

[codecov]

Codecov Report

Merging #299 (dbcd7b0) into master (fa6cf30) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #299   +/-   ##
=======================================
  Coverage   57.88%   57.89%           
=======================================
  Files         249      249           
  Lines       28094    28097    +3     
=======================================
+ Hits        16263    16266    +3     
  Misses      11831    11831           

Flag	Coverage Δ
gmosls	39.21% <100.00%> (+<0.01%)	⬆️
integration	34.23% <100.00%> (+<0.01%)	⬆️
regression	29.95% <0.00%> (-0.01%)	⬇️
slow	44.05% <100.00%> (+<0.01%)	⬆️
unit	47.85% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
recipe_system/reduction/coreReduce.py	69.01% <100.00%> (+0.44%)	⬆️

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