Adding/Fixing ClipUnstructuredGrid

src/Cxx/UnstructuredGrid/ClipUnstructuredGridWithPlane.cxx

src/Cxx/UnstructuredGrid/ClipUnstructuredGridWithPlane.md

src/Cxx/UnstructuredGrid/ClipUnstructuredGridWithPlane2.cxx

src/Cxx/UnstructuredGrid/ClipUnstructuredGridWithPlane2.md

src/Python/UnstructuredGrid/ClipUnstructuredGridWithPlane.md

src/Python/UnstructuredGrid/ClipUnstructuredGridWithPlane.py

...Python/UnstructuredGrid/ClipUnstructuredGridWithPlane2.md

...Python/UnstructuredGrid/ClipUnstructuredGridWithPlane2.py

src/PythonicAPI.md

...onicAPI/UnstructuredGrid/ClipUnstructuredGridWithPlane.md

...onicAPI/UnstructuredGrid/ClipUnstructuredGridWithPlane.py

...nicAPI/UnstructuredGrid/ClipUnstructuredGridWithPlane2.md

...nicAPI/UnstructuredGrid/ClipUnstructuredGridWithPlane2.py

src/PythonicAPI/Visualization/Kitchen.py

...x/UnstructuredGrid/TestClipUnstructuredGridWithPlane2.png

...n/UnstructuredGrid/TestClipUnstructuredGridWithPlane2.png

...PI/UnstructuredGrid/TestClipUnstructuredGridWithPlane.png

...I/UnstructuredGrid/TestClipUnstructuredGridWithPlane2.png