Remove unicode superscripts

[lthall]

I would like to discuss the possibility of still using it for comments in the code as it is much easier to read. This has been used in the EKF and Sub to great effect.

[tpwrules]

I think the American way would be "m/s^2" (caret instead of Unicode). "m/s/s" certainly appears strange to my eyes.

[timtuxworth]

It seems like a very antiquated position to be against unicode.

[IamPete1]

I think the American way would be "m/s^2" (caret instead of Unicode). "m/s/s" certainly appears strange to my eyes.

m/s^2 would be my preference too.

[peterbarker]

m/s/s is closer to what we use for variable names.