Fix FileSystemIterator without SKIP_DOTS

There were two separate bugs here:
* The get_iterator implementation did not match the Iterator
implementation. In particular, get_iterat

Fix FileSystemIterator without SKIP_DOTS

There were two separate bugs here:
* The get_iterator implementation did not match the Iterator
implementation. In particular, get_iterator did not respect
SKIP_DOTS.
* The constructor did not honor an explicitly omitted SKIP_DOTS
flag. It could still be unset through setFlags() though.

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