added fixed objective convenience function
added fixed objective convenience function

krishauser/Klampt,hpbader42/Klampt,krishauser/Klampt,bbgw/Klampt,bbgw/Klampt,hpbader42/Klampt,YilunZhou/Klampt,bbgw/Klampt,arocchi/Klampt,hpbader42/Klampt,arocchi/Klampt,krishauser/Klampt,krishauser/Klampt,krishauser/Klampt,YilunZhou/Klampt,YilunZhou/Klampt,krishauser/Klampt,arocchi/Klampt,hpbader42/Klampt,YilunZhou/Klampt,arocchi/Klampt,bbgw/Klampt,hpbader42/Klampt