post-initialization add_variable() is unsupported
post-initialization add_variable() is unsupported

We might want to change that eventually, but for now let's just try to
catch it when it happens.

salazardetroya/libmesh,permcody/libmesh,Mbewu/libmesh,cahaynes/libmesh,Mbewu/libmesh,libMesh/libmesh,balborian/libmesh,hrittich/libmesh,karpeev/libmesh,BalticPinguin/libmesh,benkirk/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,pbauman/libmesh,dschwen/libmesh,hrittich/libmesh,cahaynes/libmesh,dmcdougall/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,90jrong/libmesh,permcody/libmesh,pbauman/libmesh,coreymbryant/libmesh,90jrong/libmesh,permcody/libmesh,roystgnr/libmesh,dschwen/libmesh,Mbewu/libmesh,roystgnr/libmesh,balborian/libmesh,capitalaslash/libmesh,dmcdougall/libmesh,benkirk/libmesh,90jrong/libmesh,Mbewu/libmesh,vikramvgarg/libmesh,friedmud/libmesh,giorgiobornia/libmesh,pbauman/libmesh,salazardetroya/libmesh,hrittich/libmesh,cahaynes/libmesh,cahaynes/libmesh,dknez/libmesh,aeslaughter/libmesh,karpeev/libmesh,capitalaslash/libmesh,dknez/libmesh,giorgiobornia/libmesh,giorgiobornia/libmesh,karpeev/libmesh,aeslaughter/libmesh,libMesh/libmesh,benkirk/libmesh,libMesh/libmesh,aeslaughter/libmesh,pbauman/libmesh,BalticPinguin/libmesh,pbauman/libmesh,coreymbryant/libmesh,coreymbryant/libmesh,permcody/libmesh,salazardetroya/libmesh,roystgnr/libmesh,jiangwen84/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,hrittich/libmesh,coreymbryant/libmesh,BalticPinguin/libmesh,friedmud/libmesh,balborian/libmesh,capitalaslash/libmesh,vikramvgarg/libmesh,90jrong/libmesh,vikramvgarg/libmesh,dmcdougall/libmesh,vikramvgarg/libmesh,dknez/libmesh,friedmud/libmesh,90jrong/libmesh,pbauman/libmesh,jwpeterson/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,salazardetroya/libmesh,capitalaslash/libmesh,salazardetroya/libmesh,dschwen/libmesh,balborian/libmesh,cahaynes/libmesh,Mbewu/libmesh,aeslaughter/libmesh,Mbewu/libmesh,friedmud/libmesh,coreymbryant/libmesh,benkirk/libmesh,dmcdougall/libmesh,capitalaslash/libmesh,jiangwen84/libmesh,libMesh/libmesh,90jrong/libmesh,karpeev/libmesh,roystgnr/libmesh,jiangwen84/libmesh,balborian/libmesh,roystgnr/libmesh,libMesh/libmesh,dknez/libmesh,pbauman/libmesh,aeslaughter/libmesh,libMesh/libmesh,BalticPinguin/libmesh,dknez/libmesh,libMesh/libmesh,jiangwen84/libmesh,cahaynes/libmesh,Mbewu/libmesh,balborian/libmesh,salazardetroya/libmesh,giorgiobornia/libmesh,pbauman/libmesh,giorgiobornia/libmesh,coreymbryant/libmesh,vikramvgarg/libmesh,dknez/libmesh,jwpeterson/libmesh,90jrong/libmesh,friedmud/libmesh,hrittich/libmesh,Mbewu/libmesh,benkirk/libmesh,dschwen/libmesh,friedmud/libmesh,jiangwen84/libmesh,balborian/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,90jrong/libmesh,vikramvgarg/libmesh,jwpeterson/libmesh,roystgnr/libmesh,balborian/libmesh,svallaghe/libmesh,balborian/libmesh,hrittich/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,aeslaughter/libmesh,friedmud/libmesh,dmcdougall/libmesh,90jrong/libmesh,benkirk/libmesh,aeslaughter/libmesh,capitalaslash/libmesh,pbauman/libmesh,permcody/libmesh,aeslaughter/libmesh,libMesh/libmesh,svallaghe/libmesh,vikramvgarg/libmesh,karpeev/libmesh,giorgiobornia/libmesh,aeslaughter/libmesh,dschwen/libmesh,svallaghe/libmesh,permcody/libmesh,svallaghe/libmesh,dmcdougall/libmesh,dschwen/libmesh,hrittich/libmesh,vikramvgarg/libmesh,friedmud/libmesh,karpeev/libmesh,svallaghe/libmesh,cahaynes/libmesh,benkirk/libmesh,salazardetroya/libmesh,dschwen/libmesh,svallaghe/libmesh,coreymbryant/libmesh,balborian/libmesh,svallaghe/libmesh,benkirk/libmesh,coreymbryant/libmesh,benkirk/libmesh,Mbewu/libmesh,cahaynes/libmesh,hrittich/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,jiangwen84/libmesh,jiangwen84/libmesh,karpeev/libmesh,salazardetroya/libmesh,jiangwen84/libmesh,hrittich/libmesh,friedmud/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,roystgnr/libmesh,dmcdougall/libmesh,karpeev/libmesh,permcody/libmesh,dknez/libmesh,dmcdougall/libmesh,dknez/libmesh,permcody/libmesh,dschwen/libmesh,jwpeterson/libmesh,vikramvgarg/libmesh