Fix warnings in io/ply_io.h
Fix warnings in io/ply_io.h

> ply_io.h:524:29: warning: private field 'vertex_properties_counter_' is not used [-Wunused-private-field]

KevenRing/pcl,nikste/pcl,chenxingzhe/pcl,wgapl/pcl,v4hn/pcl,starius/pcl,raydtang/pcl,shangwuhencc/pcl,fskuka/pcl,ResByte/pcl,MMiknis/pcl,mschoeler/pcl,3dtof/pcl,Tabjones/pcl,sbec/pcl,v4hn/pcl,nh2/pcl,pkuhto/pcl,3dtof/pcl,the-glu/pcl,simonleonard/pcl,ipa-rmb/pcl,ipa-rmb/pcl,mschoeler/pcl,MMiknis/pcl,ResByte/pcl,the-glu/pcl,DaikiMaekawa/pcl,starius/pcl,damienjadeduff/pcl,lebronzhang/pcl,cascheberg/pcl,sbec/pcl,MMiknis/pcl,ipa-rmb/pcl,damienjadeduff/pcl,sbec/pcl,lydhr/pcl,krips89/pcl_newfeatures,msalvato/pcl_kinfu_highres,kanster/pcl,msalvato/pcl_kinfu_highres,jeppewalther/kinfu_segmentation,chatchavan/pcl,cascheberg/pcl,KevenRing/pcl,soulsheng/pcl,DaikiMaekawa/pcl,zavataafnan/pcl-truck,MMiknis/pcl,mschoeler/pcl,zhangxaochen/pcl,closerbibi/pcl,raydtang/pcl,kanster/pcl,drmateo/pcl,RufaelDev/pcc-mp3dg,kanster/pcl,mschoeler/pcl,closerbibi/pcl,lydhr/pcl,3dtof/pcl,chenxingzhe/pcl,ResByte/pcl,jeppewalther/kinfu_segmentation,RufaelDev/pcc-mp3dg,nh2/pcl,chenxingzhe/pcl,MMiknis/pcl,jakobwilm/pcl,srbhprajapati/pcl,shyamalschandra/pcl,jeppewalther/kinfu_segmentation,kanster/pcl,mikhail-matrosov/pcl,KevenRing/pcl,jakobwilm/pcl,stefanbuettner/pcl,3dtof/pcl,cascheberg/pcl,mschoeler/pcl,locnx1984/pcl,zavataafnan/pcl-truck,DaikiMaekawa/pcl,fanxiaochen/mypcltest,fskuka/pcl,stfuchs/pcl,mikhail-matrosov/pcl,nikste/pcl,krips89/pcl_newfeatures,fskuka/pcl,soulsheng/pcl,simonleonard/pcl,chatchavan/pcl,pkuhto/pcl,locnx1984/pcl,msalvato/pcl_kinfu_highres,shivmalhotra/pcl,soulsheng/pcl,KevenRing/pcl,shangwuhencc/pcl,lebronzhang/pcl,mikhail-matrosov/pcl,krips89/pcl_newfeatures,stefanbuettner/pcl,simonleonard/pcl,Tabjones/pcl,stfuchs/pcl,wgapl/pcl,raydtang/pcl,shivmalhotra/pcl,damienjadeduff/pcl,DaikiMaekawa/pcl,zavataafnan/pcl-truck,fskuka/pcl,wgapl/pcl,drmateo/pcl,raydtang/pcl,zhangxaochen/pcl,shivmalhotra/pcl,fanxiaochen/mypcltest,stefanbuettner/pcl,shivmalhotra/pcl,starius/pcl,nh2/pcl,lebronzhang/pcl,fanxiaochen/mypcltest,fanxiaochen/mypcltest,stefanbuettner/pcl,shyamalschandra/pcl,zavataafnan/pcl-truck,shyamalschandra/pcl,KevenRing/vlp,pkuhto/pcl,zhangxaochen/pcl,lebronzhang/pcl,sbec/pcl,jakobwilm/pcl,shangwuhencc/pcl,simonleonard/pcl,closerbibi/pcl,shyamalschandra/pcl,shivmalhotra/pcl,stfuchs/pcl,kanster/pcl,zhangxaochen/pcl,damienjadeduff/pcl,srbhprajapati/pcl,closerbibi/pcl,sbec/pcl,ResByte/pcl,msalvato/pcl_kinfu_highres,RufaelDev/pcc-mp3dg,zavataafnan/pcl-truck,nikste/pcl,jakobwilm/pcl,chenxingzhe/pcl,RufaelDev/pcc-mp3dg,srbhprajapati/pcl,ipa-rmb/pcl,chatchavan/pcl,drmateo/pcl,zhangxaochen/pcl,LZRS/pcl,KevenRing/vlp,srbhprajapati/pcl,starius/pcl,lydhr/pcl,KevenRing/vlp,locnx1984/pcl,wgapl/pcl,jeppewalther/kinfu_segmentation,LZRS/pcl,lydhr/pcl,Tabjones/pcl,mikhail-matrosov/pcl,v4hn/pcl,stefanbuettner/pcl,ResByte/pcl,krips89/pcl_newfeatures,LZRS/pcl,shyamalschandra/pcl,starius/pcl,KevenRing/pcl,soulsheng/pcl,closerbibi/pcl,DaikiMaekawa/pcl,LZRS/pcl,nikste/pcl,v4hn/pcl,LZRS/pcl,simonleonard/pcl,wgapl/pcl,shangwuhencc/pcl,chenxingzhe/pcl,fanxiaochen/mypcltest,lydhr/pcl,cascheberg/pcl,RufaelDev/pcc-mp3dg,nikste/pcl,msalvato/pcl_kinfu_highres,cascheberg/pcl,pkuhto/pcl,Tabjones/pcl,stfuchs/pcl,drmateo/pcl,jakobwilm/pcl,the-glu/pcl,jeppewalther/kinfu_segmentation,damienjadeduff/pcl,KevenRing/vlp,nh2/pcl,Tabjones/pcl,srbhprajapati/pcl,lebronzhang/pcl,v4hn/pcl,shangwuhencc/pcl,chatchavan/pcl,the-glu/pcl,the-glu/pcl,soulsheng/pcl,fskuka/pcl,KevenRing/vlp,3dtof/pcl,raydtang/pcl,ipa-rmb/pcl,pkuhto/pcl,stfuchs/pcl,locnx1984/pcl,krips89/pcl_newfeatures,drmateo/pcl,mikhail-matrosov/pcl,locnx1984/pcl