Try to avoid O(n) delete_node() cost when possible
Try to avoid O(n) delete_node() cost when possible


git-svn-id: e88a1e38e13faf406e05cc89eca8dd613216f6c4@1833 434f946d-2f3d-0410-ba4c-cb9f52fb0dbf

friedmud/libmesh,hrittich/libmesh,dmcdougall/libmesh,dmcdougall/libmesh,roystgnr/libmesh,aeslaughter/libmesh,roystgnr/libmesh,aeslaughter/libmesh,libMesh/libmesh,libMesh/libmesh,giorgiobornia/libmesh,balborian/libmesh,coreymbryant/libmesh,dknez/libmesh,balborian/libmesh,90jrong/libmesh,capitalaslash/libmesh,dknez/libmesh,coreymbryant/libmesh,hrittich/libmesh,benkirk/libmesh,BalticPinguin/libmesh,dmcdougall/libmesh,jwpeterson/libmesh,dknez/libmesh,dknez/libmesh,libMesh/libmesh,giorgiobornia/libmesh,svallaghe/libmesh,benkirk/libmesh,roystgnr/libmesh,libMesh/libmesh,90jrong/libmesh,friedmud/libmesh,90jrong/libmesh,svallaghe/libmesh,capitalaslash/libmesh,hrittich/libmesh,coreymbryant/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,balborian/libmesh,vikramvgarg/libmesh,friedmud/libmesh,pbauman/libmesh,svallaghe/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,90jrong/libmesh,jwpeterson/libmesh,friedmud/libmesh,svallaghe/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,friedmud/libmesh,coreymbryant/libmesh,dschwen/libmesh,jwpeterson/libmesh,dschwen/libmesh,hrittich/libmesh,libMesh/libmesh,cahaynes/libmesh,benkirk/libmesh,dschwen/libmesh,friedmud/libmesh,cahaynes/libmesh,90jrong/libmesh,cahaynes/libmesh,BalticPinguin/libmesh,aeslaughter/libmesh,giorgiobornia/libmesh,pbauman/libmesh,benkirk/libmesh,capitalaslash/libmesh,aeslaughter/libmesh,balborian/libmesh,capitalaslash/libmesh,hrittich/libmesh,balborian/libmesh,cahaynes/libmesh,vikramvgarg/libmesh,coreymbryant/libmesh,svallaghe/libmesh,benkirk/libmesh,dknez/libmesh,hrittich/libmesh,roystgnr/libmesh,libMesh/libmesh,svallaghe/libmesh,dschwen/libmesh,90jrong/libmesh,svallaghe/libmesh,vikramvgarg/libmesh,aeslaughter/libmesh,dmcdougall/libmesh,friedmud/libmesh,vikramvgarg/libmesh,svallaghe/libmesh,BalticPinguin/libmesh,giorgiobornia/libmesh,aeslaughter/libmesh,pbauman/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,hrittich/libmesh,giorgiobornia/libmesh,vikramvgarg/libmesh,BalticPinguin/libmesh,coreymbryant/libmesh,BalticPinguin/libmesh,pbauman/libmesh,90jrong/libmesh,dknez/libmesh,balborian/libmesh,pbauman/libmesh,svallaghe/libmesh,friedmud/libmesh,jwpeterson/libmesh,aeslaughter/libmesh,pbauman/libmesh,vikramvgarg/libmesh,coreymbryant/libmesh,balborian/libmesh,aeslaughter/libmesh,dschwen/libmesh,giorgiobornia/libmesh,giorgiobornia/libmesh,vikramvgarg/libmesh,dmcdougall/libmesh,balborian/libmesh,hrittich/libmesh,90jrong/libmesh,pbauman/libmesh,cahaynes/libmesh,dschwen/libmesh,cahaynes/libmesh,benkirk/libmesh,jwpeterson/libmesh,dknez/libmesh,benkirk/libmesh,vikramvgarg/libmesh,roystgnr/libmesh,90jrong/libmesh,dschwen/libmesh,BalticPinguin/libmesh,benkirk/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,cahaynes/libmesh,dmcdougall/libmesh,balborian/libmesh,dmcdougall/libmesh,roystgnr/libmesh,benkirk/libmesh,aeslaughter/libmesh,vikramvgarg/libmesh,pbauman/libmesh,cahaynes/libmesh,hrittich/libmesh,giorgiobornia/libmesh,roystgnr/libmesh,friedmud/libmesh,balborian/libmesh,libMesh/libmesh,dmcdougall/libmesh,roystgnr/libmesh,coreymbryant/libmesh,dschwen/libmesh,pbauman/libmesh,dknez/libmesh,libMesh/libmesh