Skip neighbors and neighbor offspring which are not in the range.
Skip neighbors and neighbor offspring which are not in the range.

This fixes some of the issues with non-contiguous ranges I was seeing,
although the results are still not perfect for all partitionings.

balborian/libmesh,BalticPinguin/libmesh,pbauman/libmesh,jwpeterson/libmesh,benkirk/libmesh,giorgiobornia/libmesh,benkirk/libmesh,giorgiobornia/libmesh,pbauman/libmesh,pbauman/libmesh,libMesh/libmesh,capitalaslash/libmesh,libMesh/libmesh,jwpeterson/libmesh,90jrong/libmesh,vikramvgarg/libmesh,benkirk/libmesh,balborian/libmesh,pbauman/libmesh,roystgnr/libmesh,dschwen/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,hrittich/libmesh,capitalaslash/libmesh,hrittich/libmesh,svallaghe/libmesh,svallaghe/libmesh,balborian/libmesh,svallaghe/libmesh,BalticPinguin/libmesh,90jrong/libmesh,balborian/libmesh,roystgnr/libmesh,svallaghe/libmesh,balborian/libmesh,benkirk/libmesh,capitalaslash/libmesh,libMesh/libmesh,vikramvgarg/libmesh,benkirk/libmesh,roystgnr/libmesh,jwpeterson/libmesh,pbauman/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,dschwen/libmesh,giorgiobornia/libmesh,hrittich/libmesh,giorgiobornia/libmesh,vikramvgarg/libmesh,libMesh/libmesh,90jrong/libmesh,BalticPinguin/libmesh,libMesh/libmesh,svallaghe/libmesh,90jrong/libmesh,svallaghe/libmesh,dschwen/libmesh,vikramvgarg/libmesh,balborian/libmesh,giorgiobornia/libmesh,hrittich/libmesh,hrittich/libmesh,benkirk/libmesh,hrittich/libmesh,jwpeterson/libmesh,vikramvgarg/libmesh,balborian/libmesh,roystgnr/libmesh,svallaghe/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,balborian/libmesh,roystgnr/libmesh,dschwen/libmesh,roystgnr/libmesh,pbauman/libmesh,pbauman/libmesh,hrittich/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,giorgiobornia/libmesh,dschwen/libmesh,pbauman/libmesh,svallaghe/libmesh,BalticPinguin/libmesh,libMesh/libmesh,90jrong/libmesh,benkirk/libmesh,dschwen/libmesh,roystgnr/libmesh,hrittich/libmesh,vikramvgarg/libmesh,90jrong/libmesh,BalticPinguin/libmesh,pbauman/libmesh,90jrong/libmesh,balborian/libmesh,benkirk/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,90jrong/libmesh,vikramvgarg/libmesh,BalticPinguin/libmesh,90jrong/libmesh,dschwen/libmesh,capitalaslash/libmesh,vikramvgarg/libmesh,jwpeterson/libmesh,libMesh/libmesh,benkirk/libmesh,libMesh/libmesh,hrittich/libmesh,jwpeterson/libmesh,vikramvgarg/libmesh,balborian/libmesh,dschwen/libmesh