Cleanup VTK's Python package.
VTK's wrapped C++-Python module libraries are built under the `VTK_BUILD_PYTHON_MODULE_DIR`. That way, we don't need to add extra paths to locate those. Since those are indeed Python module files, they should indeed be under the VTK_BUILD_PYTHON_MODULE_DIR. VTK's Python package is built under the path specified by `VTK_BUILD_PYTHON_MODULE_DIR` and installed to `VTK_INSTALL_PYTHON_MODULE_DIR`. Improved defaults for VTK_BUILD_PYTHON_MODULE_DIR and VTK_INSTALL_PYTHON_MODULE_DIR. The new defaults avoid having to separately deal with python module paths for build and install directories.
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