Fix BIPM file creation/logging

[dlakaplan]

Addresses #10:

• Fixed header of BIPM files so that the first line is correct (e.g., # TAI TT(BIPM2022))
• Created TT/BIPM 2022 file and fixed TT/BIPM 2020 file so that it is no longer a copy of TT/BIPM 2021
• Added a log entry for TT/BIPM 2022
• Made it so that if it tries to read file a log file that does not exist it will be created (useful when adding in new files)

I don't understand why the other BIPM files get log entries like:

2023-12-01 15:04:36.856 - Failed to download: HTTP Error 404: Not Found

when running:

python ./update_clock_corrections.py --file tai2tt_bipm2021.clk --no-respect-interval --gh-pages ./gh-pages

but that is a separate issue. At least when I run that this does not throw an exception.

[dlakaplan]

There was also an issue I don't understand where the lambda to update the file was trying to download the wrong one. So I would try to update 2021, but it would start trying to download 1992 and throw an exception because the URL was wrong (that is a separate issue). I changed the lambda to functools.partial and I think it works correctly now.

[dlakaplan]

Looks like the tempo2 files were updated on 2023-11-14. So one could use them or the ones here (they seem the same).