Make sure that parameter have correct units

[eriktamsen]

Apparently currently the parameters are just check to have any kind of unit, but we need to make sure they have the right ones.

[srosenbu]

This seems like an easy fix. We just need to compare the units in the input dictionary to the ones in the defualt dictionary

[aradermacher]

I suggest to move all parameters into default and load those as default in the init, updating with the on set by the user.