Clean and fix STL reader.
Clean and fix STL reader.

STL reader used to fail loading ASCII files in some situation.
See ParaView tickt #15243.
Fix that and now print the line count on error.

Change-Id: I843b44ce29257450b96ee67778ab09d82445892d

sankhesh/VTK,mspark93/VTK,candy7393/VTK,mspark93/VTK,mspark93/VTK,sumedhasingla/VTK,SimVascular/VTK,jmerkow/VTK,hendradarwin/VTK,keithroe/vtkoptix,ashray/VTK-EVM,msmolens/VTK,ashray/VTK-EVM,candy7393/VTK,gram526/VTK,demarle/VTK,candy7393/VTK,keithroe/vtkoptix,sankhesh/VTK,demarle/VTK,sumedhasingla/VTK,gram526/VTK,mspark93/VTK,jmerkow/VTK,jmerkow/VTK,demarle/VTK,jmerkow/VTK,demarle/VTK,SimVascular/VTK,keithroe/vtkoptix,gram526/VTK,sankhesh/VTK,sankhesh/VTK,jmerkow/VTK,demarle/VTK,SimVascular/VTK,sankhesh/VTK,candy7393/VTK,sumedhasingla/VTK,ashray/VTK-EVM,msmolens/VTK,keithroe/vtkoptix,jmerkow/VTK,gram526/VTK,mspark93/VTK,gram526/VTK,sankhesh/VTK,ashray/VTK-EVM,gram526/VTK,hendradarwin/VTK,SimVascular/VTK,candy7393/VTK,demarle/VTK,msmolens/VTK,demarle/VTK,sankhesh/VTK,demarle/VTK,gram526/VTK,jmerkow/VTK,SimVascular/VTK,SimVascular/VTK,mspark93/VTK,keithroe/vtkoptix,sumedhasingla/VTK,hendradarwin/VTK,sumedhasingla/VTK,ashray/VTK-EVM,keithroe/vtkoptix,sumedhasingla/VTK,sumedhasingla/VTK,SimVascular/VTK,msmolens/VTK,candy7393/VTK,hendradarwin/VTK,msmolens/VTK,msmolens/VTK,hendradarwin/VTK,sumedhasingla/VTK,ashray/VTK-EVM,mspark93/VTK,hendradarwin/VTK,sankhesh/VTK,jmerkow/VTK,SimVascular/VTK,msmolens/VTK,mspark93/VTK,keithroe/vtkoptix,ashray/VTK-EVM,candy7393/VTK,msmolens/VTK,ashray/VTK-EVM,candy7393/VTK,hendradarwin/VTK,keithroe/vtkoptix,gram526/VTK