merge: handle directory renames
commit: handle new copy dirstate case correctly
findcopies:
keep a map of all copies found for directory logic
add dirs filter
check for merge:followdirs config option
generate a directory move map
find files that match directory move map
manifestmerge:
add directory rename cases
applyupdates:
skip actions with None file
add "d" action
recordupdates:
add "d" action
add simple directory rename test
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