evolve: (issue4386) cleanup, split, fold and bijection in `hg prune` Before this patch, the prune command was splitting and folding implicitely based on the number of successors and precursors. This patch makes the two behavior explicit by requesting a flag to perform a split or a fold.

syntax: re
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^docs/build/
^docs/html/
^html/
\.pyc$
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^tests/easy_run.sh$
^build/
^MANIFEST$
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