Fix warnings in geometry/test_mesh_circulators.cpp
Fix warnings in geometry/test_mesh_circulators.cpp

> test_mesh_circulators.cpp:98:22: warning: comparison of integers of different signs: 'int' and 'size_type' (aka 'unsigned long') [-Wsign-compare]
> test_mesh_circulators.cpp:498:37: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]
> test_mesh_circulators.cpp:527:37: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]

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