More assertions in packed_range methods
More assertions in packed_range methods

It turns out that these weren't triggered by the bug I was hunting,
but they're probably a good idea for making future packed_range code
easier to debug.

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