FIX: limit complex additions to efield, bfield.
FIX: limit complex additions to efield, bfield.

Tested for both purely real modes, and for complex modes.

Change-Id: I0b9f04ae23e41fb8c26700da4d750dbc56704063

keithroe/vtkoptix,collects/VTK,ashray/VTK-EVM,keithroe/vtkoptix,spthaolt/VTK,spthaolt/VTK,jmerkow/VTK,sankhesh/VTK,spthaolt/VTK,msmolens/VTK,jmerkow/VTK,johnkit/vtk-dev,hendradarwin/VTK,sankhesh/VTK,jmerkow/VTK,biddisco/VTK,collects/VTK,ashray/VTK-EVM,msmolens/VTK,sumedhasingla/VTK,demarle/VTK,ashray/VTK-EVM,sumedhasingla/VTK,daviddoria/PointGraphsPhase1,keithroe/vtkoptix,SimVascular/VTK,jmerkow/VTK,gram526/VTK,demarle/VTK,sumedhasingla/VTK,candy7393/VTK,daviddoria/PointGraphsPhase1,biddisco/VTK,ashray/VTK-EVM,collects/VTK,candy7393/VTK,berendkleinhaneveld/VTK,biddisco/VTK,collects/VTK,sankhesh/VTK,keithroe/vtkoptix,mspark93/VTK,gram526/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,collects/VTK,ashray/VTK-EVM,spthaolt/VTK,gram526/VTK,aashish24/VTK-old,jmerkow/VTK,johnkit/vtk-dev,hendradarwin/VTK,ashray/VTK-EVM,gram526/VTK,berendkleinhaneveld/VTK,cjh1/VTK,hendradarwin/VTK,biddisco/VTK,msmolens/VTK,aashish24/VTK-old,SimVascular/VTK,hendradarwin/VTK,biddisco/VTK,spthaolt/VTK,mspark93/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,sumedhasingla/VTK,candy7393/VTK,johnkit/vtk-dev,candy7393/VTK,mspark93/VTK,biddisco/VTK,demarle/VTK,sumedhasingla/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,gram526/VTK,mspark93/VTK,hendradarwin/VTK,msmolens/VTK,demarle/VTK,mspark93/VTK,daviddoria/PointGraphsPhase1,sumedhasingla/VTK,daviddoria/PointGraphsPhase1,spthaolt/VTK,jmerkow/VTK,johnkit/vtk-dev,gram526/VTK,ashray/VTK-EVM,SimVascular/VTK,SimVascular/VTK,demarle/VTK,SimVascular/VTK,demarle/VTK,daviddoria/PointGraphsPhase1,sankhesh/VTK,mspark93/VTK,hendradarwin/VTK,gram526/VTK,cjh1/VTK,jmerkow/VTK,gram526/VTK,cjh1/VTK,SimVascular/VTK,SimVascular/VTK,msmolens/VTK,berendkleinhaneveld/VTK,biddisco/VTK,candy7393/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,ashray/VTK-EVM,daviddoria/PointGraphsPhase1,cjh1/VTK,collects/VTK,msmolens/VTK,candy7393/VTK,sankhesh/VTK,keithroe/vtkoptix,mspark93/VTK,demarle/VTK,aashish24/VTK-old,johnkit/vtk-dev,jmerkow/VTK,aashish24/VTK-old,keithroe/vtkoptix,spthaolt/VTK,cjh1/VTK,demarle/VTK,candy7393/VTK,candy7393/VTK,keithroe/vtkoptix,mspark93/VTK,sumedhasingla/VTK,sankhesh/VTK,sankhesh/VTK,hendradarwin/VTK,aashish24/VTK-old,sankhesh/VTK,cjh1/VTK,msmolens/VTK,sumedhasingla/VTK,msmolens/VTK,aashish24/VTK-old