remove unused alpha handling code in octree originally added in 201461e8c99b1ca2468602c3d59b1adaa2f96056 but made redundant in b3711b07d19e4b5506ec4675efd04895ddf6fb8
remove unused alpha handling code in octree originally added in 201461e8c99b1ca2468602c3d59b1adaa2f96056 but made redundant in b3711b07d19e4b5506ec4675efd04895ddf6fb8

rouault/mapnik,mapnik/mapnik,cjmayo/mapnik,jwomeara/mapnik,mapnik/mapnik,naturalatlas/mapnik,manz/python-mapnik,mapnik/mapnik,lightmare/mapnik,mapnik/python-mapnik,tomhughes/mapnik,mbrukman/mapnik,cjmayo/mapnik,sebastic/python-mapnik,qianwenming/mapnik,mapnik/python-mapnik,lightmare/mapnik,CartoDB/mapnik,cjmayo/mapnik,pramsey/mapnik,tomhughes/mapnik,davenquinn/python-mapnik,sebastic/python-mapnik,manz/python-mapnik,mbrukman/mapnik,zerebubuth/mapnik,Airphrame/mapnik,pramsey/mapnik,zerebubuth/mapnik,kapouer/mapnik,naturalatlas/mapnik,qianwenming/mapnik,mbrukman/mapnik,stefanklug/mapnik,Airphrame/mapnik,mapycz/python-mapnik,rouault/mapnik,lightmare/mapnik,pramsey/mapnik,Mappy/mapnik,yiqingj/work,pnorman/mapnik,manz/python-mapnik,pnorman/mapnik,cjmayo/mapnik,jwomeara/mapnik,garnertb/python-mapnik,mapycz/mapnik,Airphrame/mapnik,mapnik/mapnik,mapycz/mapnik,garnertb/python-mapnik,whuaegeanse/mapnik,Uli1/mapnik,stefanklug/mapnik,garnertb/python-mapnik,strk/mapnik,davenquinn/python-mapnik,kapouer/mapnik,mbrukman/mapnik,Uli1/mapnik,yiqingj/work,mapycz/python-mapnik,whuaegeanse/mapnik,whuaegeanse/mapnik,kapouer/mapnik,jwomeara/mapnik,stefanklug/mapnik,Airphrame/mapnik,yiqingj/work,rouault/mapnik,Mappy/mapnik,kapouer/mapnik,CartoDB/mapnik,zerebubuth/mapnik,strk/mapnik,lightmare/mapnik,tomhughes/python-mapnik,rouault/mapnik,CartoDB/mapnik,tomhughes/mapnik,stefanklug/mapnik,Uli1/mapnik,yiqingj/work,yohanboniface/python-mapnik,whuaegeanse/mapnik,naturalatlas/mapnik,qianwenming/mapnik,Mappy/mapnik,yohanboniface/python-mapnik,sebastic/python-mapnik,pnorman/mapnik,davenquinn/python-mapnik,tomhughes/python-mapnik,Mappy/mapnik,mapycz/mapnik,mapnik/python-mapnik,pnorman/mapnik,naturalatlas/mapnik,qianwenming/mapnik,tomhughes/mapnik,pramsey/mapnik,yohanboniface/python-mapnik,Uli1/mapnik,tomhughes/python-mapnik,jwomeara/mapnik,strk/mapnik,strk/mapnik,qianwenming/mapnik