Warnings with pandas 3

[maread99]

Note

If anyone using pandas >=3.0.0 is getting warnings being raised that aren't noted here then please add a comment with details.

Pandas warnings that require fixing:

• Pandas4Warning: 'd' is deprecated and will be removed in a future version, please use 'D' instead. Need to change four instances of "d" to "D" around here.

At some point I'll put a PR together to fix them all.