Normalization bug

[AlexanderCaichen]

Add new input variable for Preprocessor object to skip normalization in case data-to-be-preprocessed is already normalized.

[Xiaojieqiu]

Thanks @AlexanderCaichen for the great work. It will be nice to allow the preprocessing algorithm knows whether the data is already normalized or not automatically. Is this not something different?

[AlexanderCaichen]

@Xiaojieqiu Because there are so many ways of normalizing data I thought it will be difficult to have a single function automatically detect whether some data is normalized.

While I can add a check somewhere to see if some data is normalized by Dynamo, it is possible that the data to be preprocessed is already pre-normalized outside of Dynamo.

My changes simply gives the User the option of canceling normalization in Dynamo in case they pre-normalized it instead of automatically detecting normalization.