Condition in function `vindareal` looks suspicious

In [mast.py](https://github.com/staspika/python-klmast/blob/master/mast.py#L657) (function `vindareal`), the following line looks suspicious: `if self.navn == "H6" and x == 5.0 or 9.0:`. Because of operator precedence, the condition is equivalent to `if (((self.navn == "H6") and (x == 5.0)) or 9.0)` and will always return `true`. What is the intended condition, @oscarborke and @G-W-h ? ;)


