Validation function for Correction object

[RuedigerForster]

Perform following checks of an Appac object:

• are residualAreas(corrected.raw.areas) normal distributed?
• are residualAreas(corrected.raw.areas) homoskedastic?
• are residualAreas(corrected.raw.areas) autocorrelated?
• is the mean of residualAreas(corrected.raw.areas) == 0? within 2 sigma
• are the correlations of correctedRawAreas between the peaks of a sample close to the correlations of RawAreas within 2 sigma