ENH: Initially view slice 0, mimicking FLTK viewer's behavior.
ENH: Initially view slice 0, mimicking FLTK viewer's behavior.

LucasGandel/TubeTK,sumedhasingla/TubeTK,LucasGandel/TubeTK,KitwareMedical/ITKTubeTK,LucasGandel/TubeTK,matthieuheitz/TubeTK,thewtex/TubeTK,LucasGandel/TubeTK,cdeepakroy/TubeTK,KitwareMedical/TubeTK,cdeepakroy/TubeTK,thewtex/TubeTK,cdeepakroy/TubeTK,thewtex/TubeTK,cdeepakroy/TubeTK,matthieuheitz/TubeTK,sumedhasingla/TubeTK,matthieuheitz/TubeTK,aylward/ITKTubeTK,KitwareMedical/TubeTK,KitwareMedical/ITKTubeTK,aylward/ITKTubeTK,aylward/ITKTubeTK,sumedhasingla/TubeTK,KitwareMedical/ITKTubeTK,thewtex/TubeTK,KitwareMedical/TubeTK,KitwareMedical/TubeTK,KitwareMedical/ITKTubeTK,aylward/ITKTubeTK,matthieuheitz/TubeTK,sumedhasingla/TubeTK