Add normalisation method to the upload interface and amend it to the dataframe.

[sidohaakma]

In the dictionary, we have ‘norm_method’ variable which corresponds to normalization method used during DNAm data processing. This should be asked during the upload, it is the same for all samples analysed at the same age so it needs to be asked once. Options for ‘norm_method’ are 0=RAW, 1=BMIQ, 2=DASEN, 3=SWAN, 4=SQN, 5=RCP, 6=NOOB, 7=CPACOR, 8=FUNNORM, 9=OTHER