Add a function to check if TE values are in ms, otherwise update them

[eurunuela]

Closes #1150.

Changes proposed in this pull request:

• Adds a function to check if the TE values given by a user are in ms. If they are not and are below 1, it assumes they are in seconds and they get updated by multiplying by 1000. If the values are a combination of higher than one and lower than one, the function raises an error.
• Adds a unit test to ensure the functionality is correct.

[eurunuela]

I'm pretty sure this should do it but I think it would be helpful if @handwerkerd tested it on the dataset you showed earlier.

[tsalo]

I generally would prefer to raise a warning and continue without changing the data, but I can't imagine a scenario where a user might provide a value < 1 and actually intend milliseconds, so I'm good with your approach.

[handwerkerd]

Thank you for doing this! Just one minor text change.