Add scaling for profiles about flextool

[jkiviluo]

It is not be clear what kind of scaling to implement. The issue is that both proportional scaling or adding a constant can lead to capacity factors larger than one. The overall profile will also become unrealistic (both for wind and PV). One option is to scale with an exponent, which would keep the CF between 0-1. However, exponential scaling will distort the power curve in case of wind power and will probably not be correct for PV either.

Maybe a technology specific piece-wise transfer function, but reaching the desired CF would probably then require an iterative approach (and in that case it might be better to do it outside of FlexTool).