L2a header cross-checks

[mygouf]

Is your feature request related to a problem? Please describe. No

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Task 1: Check consistency between provided L2a frames from II&T data and the II&T headers keywords page.

Task 2: Check consistency between EXCAM image headers (working page) on the wiki, and II&T headers keywords.

The page EXCAM image headers (working page) should be edited to add any keywords currently missing. The II&T headers keywords page is the reference and what is currently implemented for the L1 data and what was implemented for the II&T L2a and L2b data.

Task 3: Check that the DRP implementation is consistent with the II&T headers keywords page

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[semaphoreP]

I'd add that check that the files output by the l1_to_l2a e2e test does have all the necessary headers we expect, and add this to the existing test.

[juliamilton]

Tasks 1 and 2 are complete. The historical list of L2a headers has been reviewed and updated to match the actual headers used in II&T. This information is now available in the EXCAM image headers (working page).

It seems that the page referenced for Task 3 (II&T headers keywords) no longer exists. I plan to create a new page under "Data format and volume" today, which will show the keywords included for each header in the upcoming release of L2a DRP products.

@maxwellmb @semaphoreP, could you clarify what is meant by the "list of all necessary headers" expected for inclusion in this release? Additionally, will the constants.py file mentioned in the linked issue be used? Otherwise, I’ll verify the outputs from the L2a end-to-end test to produde the list of headers currently included and flag any missing II&T keywords.