Revamped Architecture in datred + bits and bobs

FUSS.datred as changed tremendously, in the hopes that the new data reduction pipeline is more user friendly.

A lot of old code was restructured and I've added panda dataframes compatibilities (although note I usually use a tab separated format rather than csv)

Also dosctrings improved and python 3 compatible (although not 100 per cent tested)

Used for the data reduction and analysis of WR93b and WR102 (http://adsabs.harvard.edu/abs/2018MNRAS.479.4535S)