Moving quantities around in ExactSolution::_compute_error
Moving quantities around in ExactSolution::_compute_error

This is in preparation for updating to support mixed-dimension
meshes. Although this is a bit more inefficient, the code is simpler
and I thnk that since this is usually used for debugging/regression
purposes, simpler code would be preferred over higher performance
code.

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