add reference to convertImagesToSeries to series.saveAsBinarySeries docstring
add reference to convertImagesToSeries to series.saveAsBinarySeries docstring

thunder-project/thunder,mikarubi/thunder,pearsonlab/thunder,j-friedrich/thunder,mikarubi/thunder,kcompher/thunder,poolio/thunder,zhwa/thunder,poolio/thunder,j-friedrich/thunder,oliverhuangchao/thunder,kunallillaney/thunder,pearsonlab/thunder,kunallillaney/thunder,broxtronix/thunder,broxtronix/thunder,oliverhuangchao/thunder,kcompher/thunder,zhwa/thunder,jwittenbach/thunder