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The shutil.copytree() function aknowledges symlinks when given
the symlink=True argument. Other shutil functions should do this
too:
copymode(src, dst, symlinks=True)
 If both src and dst are symlinks, copy the source symlink mode
 to the destination symlink. If only one of them is a symlink,
 dereference it normally.
copystat(src, dst, symlinks=True)
 If both src and dst are symlinks, copy the statinfo of the
 source symlink to the destination symlink. If only one of them
 is a symlink, dereference it normally.
copy(src, dst, symlinks=True)
 If the src argument is a symlink, copy the source symlink
 instead of dereferencing it.
 Problem: What if dst is a symlink to a directory? Should it be
 replaced or should the symlink copied inside that directory?
copy2(src, dst, symlinks=True)
 Like copy(src, dst, symlinks=True), but copy the metadata too.
 The same problem applies.