/// <summary>
/// Return the average od signatures points number
/// </summary>
/// <param name="signer"></param>
/// <returns></returns>
public static double GetLengthAverage(this Signer signer)
{
double sum = 0;
foreach (Signature signature in signer.Signatures)
{
sum = sum + SignatureHelper.GetSignatureLength(signature);
}
return(sum / signer.Signatures.Count);
}