add round value feature as general and/or individual parameter

[kesch001de]

Hi,
First of all, great adapter, awesome job! Thanks for all your effort here!

In case there are some lower values, the calculation is really precise (what is good).
But that may cause some issue visualising the data directly.
It needs to be "fixed" with another alias and/or data field to round the data.

As you can see in my screenshot, the values can be quite long:

It would be perfect, if I would be able to set a general "round" value definition as overall/general for the whole adapter and/or for each calculation itself to be max. flexible with displaying the values.

Current, used adapter version: 0.4.15-alpha.1

Thanks,
Kevin