actually, 'vistle' seems to be a word...

add definition of 'vistle' from Urban Dictionary
disable building of IceT tests

prevents usage of GLUT and lots of deprecation warnings on os x 10.9
prevent immensely wide parameter widget if modules have float parameters
prefer TBB over OpenMP
update environment for hermit
object attachments

- allow for data objects to reference others, e.g. acceleration structures