Combine steps (functions) into main (larger) functions

[jkrick]

There are many data cleaning type functions in this notebook which need to be called twice. Once at the top and once again at the bottom of the notebook. It might be easier to group these into main functions.

Suggestion from @troyraen as to what those main functions might be: 1) Clean the data - drop bands, sigma clip, etc.; 2) Transform the data - uniform spacing, normalize, etc.; 3) Transform the data structure - pivot, drop columns, set index.

If clumping together functions, suggestion is to make it more clear what those functions are doing by using keyword arguments with booleans True/False for each step within the main function.