Ptychography -> ImageStack & dm3 working

Merged Vasudevan, Rama K requested to merge github/fork/kbschliep/kbs_ImageStack_dm3 into master

Created by: kbschliep

Changed PtchographyTranslator to ImageStackTranslator Opening folders of dm3's also works now after changing out read_image with read_dm3 and fixing a few related things. I also changed the hdf5 dataset names to be more general rather than specific for Ptychography.

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