Combined the averaged piezo functions in the totalDataProcessing.py
module to contain just one function for the piezos, one for independant
channels and one for the accelerometer channels, which takes a dataType
selection inputted via the programLaunch.py module (ex. 'PSD' or
'AutoCorr'). This made code far easier to read then having a copy and
pasted function for each separate type of data processing.

Additionally cross correlation is functioning now as well.