Add support for perturbation magnitude/direction #17
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Modifies perturbation names to include an optional magnitude, separated from the gene name by
*, i.e.p53*200,brca2*0. The magnitude is an integer, interpreted as a percentage change from base (i.e. 0 is a knockout), and is used to multiply the perturbation embedding. If no magnitude is provided, a default one of 100% is used (to be backward-compatible with the current implementation).Many of the changes are trailing-whitespace removals from an auto-formatter; the only real modifications are parsing and storing an additional
pert_magnitudearray with the rest of the data and using it to modify the embedding.