Add search hints and fix a typo in find_openni2 macro
Add search hints and fix a typo in find_openni2 macro

stfuchs/pcl,lebronzhang/pcl,krips89/pcl_newfeatures,wgapl/pcl,stfuchs/pcl,kanster/pcl,krips89/pcl_newfeatures,damienjadeduff/pcl,lebronzhang/pcl,kanster/pcl,wgapl/pcl,KevenRing/pcl,nikste/pcl,stefanbuettner/pcl,KevenRing/pcl,KevenRing/vlp,damienjadeduff/pcl,damienjadeduff/pcl,KevenRing/vlp,lebronzhang/pcl,kanster/pcl,mikhail-matrosov/pcl,ipa-rmb/pcl,nikste/pcl,lebronzhang/pcl,ipa-rmb/pcl,wgapl/pcl,stefanbuettner/pcl,mikhail-matrosov/pcl,ipa-rmb/pcl,KevenRing/vlp,drmateo/pcl,krips89/pcl_newfeatures,KevenRing/vlp,drmateo/pcl,lebronzhang/pcl,nikste/pcl,nikste/pcl,stefanbuettner/pcl,stfuchs/pcl,drmateo/pcl,nikste/pcl,drmateo/pcl,ipa-rmb/pcl,KevenRing/vlp,stefanbuettner/pcl,ipa-rmb/pcl,krips89/pcl_newfeatures,KevenRing/pcl,wgapl/pcl,stfuchs/pcl,KevenRing/pcl,damienjadeduff/pcl,kanster/pcl,wgapl/pcl,mikhail-matrosov/pcl,kanster/pcl,drmateo/pcl,damienjadeduff/pcl,mikhail-matrosov/pcl,mikhail-matrosov/pcl,stefanbuettner/pcl,stfuchs/pcl,KevenRing/pcl,krips89/pcl_newfeatures