add checkExistence to wrapper classes, added a wrapper parameter to checkExistence, added an arrayToList helper function
add checkExistence to wrapper classes, added a wrapper parameter to checkExistence, added an arrayToList helper function

chanchett/ds3_python_sdk,SpectraLogic/ds3_python_sdk,SpectraLogic/ds3_python_sdk,chanchett/ds3_python_sdk,chanchett/ds3_python_sdk,SpectraLogic/ds3_python_sdk,chanchett/ds3_python_sdk_