BUG: Trivial producer was not handling extents properly. Fixed.
BUG: Trivial producer was not handling extents properly. Fixed.

Trivial producer should not have returned the original dataset if
the requested extent is less than whole and if EXACT_EXTENT() is on.
Because in this case, the pipeline calls Crop() on the dataset later,
corrupting the original dataset for good. Instead, it should create
a copy and pass that to the output. Fixed.

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