Changes in linear_implicit_system.C for -Wshadow.
Changes in linear_implicit_system.C for -Wshadow.

Issue #24.

dschwen/libmesh,friedmud/libmesh,giorgiobornia/libmesh,BalticPinguin/libmesh,dmcdougall/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,pbauman/libmesh,pbauman/libmesh,salazardetroya/libmesh,benkirk/libmesh,giorgiobornia/libmesh,roystgnr/libmesh,permcody/libmesh,capitalaslash/libmesh,90jrong/libmesh,dmcdougall/libmesh,pbauman/libmesh,Mbewu/libmesh,giorgiobornia/libmesh,pbauman/libmesh,roystgnr/libmesh,balborian/libmesh,jwpeterson/libmesh,benkirk/libmesh,roystgnr/libmesh,jiangwen84/libmesh,cahaynes/libmesh,90jrong/libmesh,cahaynes/libmesh,giorgiobornia/libmesh,dknez/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,coreymbryant/libmesh,dmcdougall/libmesh,hrittich/libmesh,karpeev/libmesh,balborian/libmesh,markcmiller86/libmesh_silo,hrittich/libmesh,karpeev/libmesh,dschwen/libmesh,coreymbryant/libmesh,vikramvgarg/libmesh,BalticPinguin/libmesh,markcmiller86/libmesh_silo,pbauman/libmesh,benkirk/libmesh,balborian/libmesh,giorgiobornia/libmesh,90jrong/libmesh,libMesh/libmesh,permcody/libmesh,karpeev/libmesh,dschwen/libmesh,90jrong/libmesh,dschwen/libmesh,markcmiller86/libmesh_silo,capitalaslash/libmesh,capitalaslash/libmesh,aeslaughter/libmesh,karpeev/libmesh,libMesh/libmesh,pbauman/libmesh,coreymbryant/libmesh,benkirk/libmesh,salazardetroya/libmesh,salazardetroya/libmesh,jwpeterson/libmesh,svallaghe/libmesh,libMesh/libmesh,benkirk/libmesh,svallaghe/libmesh,karpeev/libmesh,karpeev/libmesh,permcody/libmesh,aeslaughter/libmesh,jwpeterson/libmesh,friedmud/libmesh,permcody/libmesh,jwpeterson/libmesh,dknez/libmesh,aeslaughter/libmesh,90jrong/libmesh,dknez/libmesh,coreymbryant/libmesh,permcody/libmesh,dmcdougall/libmesh,dknez/libmesh,libMesh/libmesh,permcody/libmesh,benkirk/libmesh,aeslaughter/libmesh,balborian/libmesh,friedmud/libmesh,svallaghe/libmesh,dknez/libmesh,dschwen/libmesh,coreymbryant/libmesh,jiangwen84/libmesh,coreymbryant/libmesh,vikramvgarg/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,hrittich/libmesh,dknez/libmesh,balborian/libmesh,aeslaughter/libmesh,karpeev/libmesh,dschwen/libmesh,Mbewu/libmesh,Mbewu/libmesh,salazardetroya/libmesh,dmcdougall/libmesh,dknez/libmesh,Mbewu/libmesh,90jrong/libmesh,friedmud/libmesh,balborian/libmesh,hrittich/libmesh,permcody/libmesh,balborian/libmesh,jiangwen84/libmesh,pbauman/libmesh,Mbewu/libmesh,dknez/libmesh,balborian/libmesh,hrittich/libmesh,vikramvgarg/libmesh,libMesh/libmesh,vikramvgarg/libmesh,coreymbryant/libmesh,capitalaslash/libmesh,svallaghe/libmesh,90jrong/libmesh,markcmiller86/libmesh_silo,vikramvgarg/libmesh,dmcdougall/libmesh,vikramvgarg/libmesh,Mbewu/libmesh,giorgiobornia/libmesh,cahaynes/libmesh,jiangwen84/libmesh,friedmud/libmesh,cahaynes/libmesh,Mbewu/libmesh,pbauman/libmesh,aeslaughter/libmesh,karpeev/libmesh,cahaynes/libmesh,roystgnr/libmesh,svallaghe/libmesh,markcmiller86/libmesh_silo,balborian/libmesh,svallaghe/libmesh,salazardetroya/libmesh,dmcdougall/libmesh,permcody/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,jiangwen84/libmesh,giorgiobornia/libmesh,cahaynes/libmesh,pbauman/libmesh,aeslaughter/libmesh,benkirk/libmesh,vikramvgarg/libmesh,svallaghe/libmesh,friedmud/libmesh,libMesh/libmesh,coreymbryant/libmesh,markcmiller86/libmesh_silo,jiangwen84/libmesh,friedmud/libmesh,vikramvgarg/libmesh,dschwen/libmesh,benkirk/libmesh,benkirk/libmesh,libMesh/libmesh,giorgiobornia/libmesh,friedmud/libmesh,dschwen/libmesh,hrittich/libmesh,BalticPinguin/libmesh,dmcdougall/libmesh,svallaghe/libmesh,jiangwen84/libmesh,jwpeterson/libmesh,Mbewu/libmesh,roystgnr/libmesh,salazardetroya/libmesh,svallaghe/libmesh,markcmiller86/libmesh_silo,jwpeterson/libmesh,libMesh/libmesh,salazardetroya/libmesh,hrittich/libmesh,markcmiller86/libmesh_silo,friedmud/libmesh,hrittich/libmesh,jiangwen84/libmesh,cahaynes/libmesh,vikramvgarg/libmesh,BalticPinguin/libmesh,salazardetroya/libmesh,cahaynes/libmesh,balborian/libmesh,aeslaughter/libmesh,hrittich/libmesh,giorgiobornia/libmesh,roystgnr/libmesh,90jrong/libmesh,90jrong/libmesh,aeslaughter/libmesh,Mbewu/libmesh