Read Sentinel V specific data packets

[jmcvey3]

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Co-authored-by: ululi1970

Issue #390

Added a few Sentinel V specific code block readers. There are a few more in the documentation that I did not add (that are not in this test file), but I added "skip this many bytes" placeholders for if they're needed in the future.

Also did a little cleanup and changed two ambiguous attribute names to something more readable (hence a lot of test files changed), and I added a hard stop to exit the forever loop problem. It may cause some partly corrupted files that would otherwise be readable to fail, but we'll see.