update ipet, fix wrong parsing of instances
update ipet, fix wrong parsing of instances

https://git.zib.de/optimization/rubberband-config/issues/11

ambros-gleixner/rubberband,ambros-gleixner/rubberband,xmunoz/rubberband,xmunoz/rubberband,xmunoz/rubberband,ambros-gleixner/rubberband,xmunoz/rubberband