Fix bug with over-agressive LineOverRunWarning

[MicahGale]

Pull Request Checklist for MontePy

Description

This fixes a bug where a file that was line-wrapped by MontePy would trigger a LineOverrunWarning when read by MontePy. The line-wrapping was manually confirmed to be producing lines that were valid MCNP lengths. This bug was caused by two issues:

1. \n was being considered part of the line. This was fixed with rstrip
2. >= was being used instead of >. This was not allowing lines that were exactly at the limit.

This also made the Warning message more helpful. The one question I struggled with is: should the information past the line length limit be truncated or not? Current behavior is that it is.

Fixes #517

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📚 Documentation preview 📚: https://montepy--799.org.readthedocs.build/en/799/