Formulas Adaptations for Arithmetics

[sbusato]

Adapt Formulas in the Ifrs17 Calculation Engine in order to unblock the Arithmetics stream.
In particular, change formulas where there is arithmetics for byte arrays.
e.g.
GetSign(...) * values
CurrentValues - PreviousValues
Interest^(-1) will now be "Power(Interest, -1)"

Work on the following branch 23166_ArithmeticsChanges .

[amuolo]

I close this since the PR #55 is closed and solves this issue.