adding 3D test dataset
work on import 3D datasets
readding 3D datasets.  Need to have 3D_example.h5 in sima/tests/data to load
Merge branch 'master' of github.com:nbdanielson/sima into 3D_buddy
added z-plane trackpad / mouse scrolling
adding z-plane scrollbox in UI form
integration of z-plane scroll box into UI
scrolling through planes is fully integrated for base image toggling.
removed unnecessary code
work on toggling 3D rois
work on 3D ROI toggling between planes
saving and loading of 3D roi sets
adding back ellipse tool
Merge branch 'master' into 3D_buddy
Merge branch 'master' into 3D_buddy
work on registration
Merge branch '3D_buddy' of github.com:nbdanielson/sima into 3D_buddy
implemented planewise 3D transforms, fixed bug in toggle_frames in align mode
show-all working for 3D
alignment and registration working for 3D
adding support for drawing circular ROIs