[struct entry] (node): Describe how it's used,

now that we've overloaded it a little, in order to detect and diagnose
the copying-directory-into-self problem.
(new_file): Remove global.
(htab): Declare global to be static.
(remember_created): Insert file name instead of dummy pointer, so
that copy.c can use the just-created directory name to detect
the copying-directory-into-self problem.

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