Fix REL_TEST macro by taking absolute value of calculated relative error, not just the numerator. Closes #9457
Fix REL_TEST macro by taking absolute value of calculated relative error, not just the numerator.
Closes #9457

idaholab/moose,andrsd/moose,sapitts/moose,harterj/moose,harterj/moose,sapitts/moose,permcody/moose,permcody/moose,lindsayad/moose,permcody/moose,laagesen/moose,laagesen/moose,sapitts/moose,andrsd/moose,idaholab/moose,jessecarterMOOSE/moose,yipenggao/moose,idaholab/moose,dschwen/moose,laagesen/moose,nuclear-wizard/moose,permcody/moose,milljm/moose,bwspenc/moose,andrsd/moose,yipenggao/moose,YaqiWang/moose,liuwenf/moose,harterj/moose,dschwen/moose,jessecarterMOOSE/moose,nuclear-wizard/moose,nuclear-wizard/moose,Chuban/moose,liuwenf/moose,YaqiWang/moose,liuwenf/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,milljm/moose,dschwen/moose,SudiptaBiswas/moose,YaqiWang/moose,lindsayad/moose,andrsd/moose,harterj/moose,harterj/moose,dschwen/moose,friedmud/moose,liuwenf/moose,milljm/moose,bwspenc/moose,jessecarterMOOSE/moose,liuwenf/moose,SudiptaBiswas/moose,andrsd/moose,SudiptaBiswas/moose,laagesen/moose,friedmud/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,Chuban/moose,bwspenc/moose,lindsayad/moose,friedmud/moose,bwspenc/moose,milljm/moose,yipenggao/moose,nuclear-wizard/moose,Chuban/moose,idaholab/moose,lindsayad/moose,YaqiWang/moose,sapitts/moose,dschwen/moose,friedmud/moose,sapitts/moose,bwspenc/moose,lindsayad/moose,liuwenf/moose,idaholab/moose,milljm/moose,laagesen/moose,yipenggao/moose,Chuban/moose