take shallow copy on dataframe processing and fix get_cmap deprecation #617
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The DataFrameProcessing class always re-assigns the
ds
column, which can raise the SettingwithCopyWarning when passing subsets of pandas dataframes to it (for example in the plot function), so this takes a shallow copy before that.Also the
matplotlib.pyplot.cm.get_cmap
function is being deprecated, so this replaces it with the recommended usage (the resampled method was added in 3.6)