Zeiss ZVI: ignore invalid plane coordinates (rebased onto dev_4_4)



This is the same as gh-544 but rebased onto dev_4_4.

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If the parsed coordinates do not account for all of the images, then we
need to ignore them.  Otherwise, openBytes with different values of 'no'
may open the same image.

See http://www.openmicroscopy.org/community/posting.php?f=13&t=5130#pr10246