BUG: Fixed functions that call deprecated SimpleITK API changes
WIP: Fix for Atlas node s.t. the dataGrabber doesn't rerun, triggering all dependent nodes to rerun as well
ENH: Atlas node prevents duplication on run
STYLE: print_workflow documentation and assertion
STYLE: renamed node so mapnode index doesn't append with session
ENH: Moved workflow printing to within subject loop to avoid multiple plotting
WIP: DEBUGGING
BUG: Atlas copying to cache now preserves timestamp of ExtendedAtlasDefinition.xml from FIRST run