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lisa.datautils: Speedup and fix df_update_duplicates()

Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_home_pr90140 into master

FIX

Fix inplace=False behavior so that it does not modify the input.

Also speedup considerably the function by assuming most duplicated values are not clustered. This is the common case and it avoids very costly iteration of duplicated values.

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