Added const modifiers to OctreePointCloud function
Added const modifiers to OctreePointCloud function

- Added const keyword to function 'OctreePointCloud::getVoxelBounds ()',
  since it internally only calls a 'const' function
  ('OctreePointCloud::genVoxelBoundsFromOctreeKey ()')
- Added const modifier to 'OctreeIterator' input argument of
  'OctreePointCloud::getVoxelBounds ()', since only 'const' functions
  of 'OctreeIterator' are called

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