ENH: append properties instead of overwrite in HDF5
ENH: append properties instead of overwrite in HDF5

richardbeare/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,BRAINSia/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,LucasGandel/ITK,LucasGandel/ITK,BRAINSia/ITK,hjmjohnson/ITK,vfonov/ITK,vfonov/ITK,thewtex/ITK,BRAINSia/ITK,thewtex/ITK,Kitware/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,hjmjohnson/ITK,vfonov/ITK,hjmjohnson/ITK,Kitware/ITK,LucasGandel/ITK,richardbeare/ITK,Kitware/ITK,LucasGandel/ITK,thewtex/ITK,BRAINSia/ITK,vfonov/ITK,BRAINSia/ITK,thewtex/ITK,vfonov/ITK,vfonov/ITK,LucasGandel/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,LucasGandel/ITK,richardbeare/ITK,richardbeare/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,LucasGandel/ITK,richardbeare/ITK,hjmjohnson/ITK,BRAINSia/ITK,vfonov/ITK,BRAINSia/ITK,richardbeare/ITK,richardbeare/ITK,vfonov/ITK