Current settings for aggregation types are too restrictive

I re-checked if we can set the aggregation type to maximum, or minimum for temperatures in our current sms staging system. Due to the default filtering the only choice that I have then is average.

I'm a bit unhappy with that, as it would mean to need some more tweaks to add a max temperature Measured Quantity in the SMS, while not using the fields that should be used for that.

So the idea is to remove the filtering of that list & adjust setting the aggregation type when we set the Measured Quantity. Still it would be helpful to set an default value if we select the measured quantity in the first place.