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Correctly format the Academic Period for summer sessions

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Link to new final grade submission documentation

Remove grading basis column

Format timestamp string differently on windows

Name latest version in changelog

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Remove mentioned of the FSC

Clarify error message and mentioned "Ex"

Switch to only using xlsxwriter

Adjust the column witdth based on the content

Explicitly set the engine to openpyxl

Remove pandas default header formatting

Reflect deprecation of the FSC in subcommand name