A modified line source with 2 APIs.
A modified line source with 2 APIs.

The user now has the choice between:
1. The original API with 2 endpoints named Point1 and Point2.
2. An API based on a vtkPoints iVar called Points (!) which lets
him specify a broken line should he decide to do so.

By default, the original API is used.

Change-Id: I382c818e17bd93c92f8a3c6955a01641c4d838b6

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