Evaluation value should be rounded

[Matthias Schoettle]

Depending on the scale factor, the result of an evaluation could be not precisely what it should be.

For instance, using 6.67 (offset 100) and two contributing features with -5 and -10, when selecting both, the evaluation will show -0.05000305.

I think it would be best to round the result, either with no decimals or max 2.

[Romain Alexandre]

Resolves #345: After receiving the values from the evaluation algorithm, it will round all the values with two decimal numbers

→ <<cset 51e2d6753f4f>>

[Romain Alexandre]

References #345: Save the value using put(..) operation

→ <<cset a1c32fedf5fc>>