Added code from Tadas for Neural Networks and his AAM code
Modified AddZerosToImage to make cleaner code and reshapes into matrix
Added the building ageing model functions (including 2 different ways of building it, either with all images or just one image per subject)

Also added a simple form of testing the ageing model
Used Tadas' code to modify building my appearance model.  Doesn't give results that I want - still working on it.

FindMean_v2 uses Tadas way of aligning data.
Simplifed PrepareImages as can now fit all images in memory so don't need to do in batches.

Also removed downsizing from WarpImages as not necessary - if want to downsize at some point then can do in a separate function