Make it work with IJ2 data structures

[rejsmont]

It would be great to implement HDF5 as IJ2 plugin so one could work with Datasets directly. This could be implemented quite quickly... Of course SCIFIO would be the next step, but this would require some architecture decisions.

For example, IOService.open(String source) only takes one argument, yet HDF5 requires both filename and dataset name. One could return some kind of lazily-loaded Dataset pointing to separate HDF5 datasets, but yeah... This really needs architecture decisions...

@ctrueden your thoughts on this?

[imagejan]

For others reading this issue: please also see the discussion on the forum at http://forum.imagej.net/t/hdf5-scifio-plugin-discussion/10070

[rejsmont]

@imagejan you earned yourself a "cross-linker" badge 🥇