Pass QT_BINARY_DIR to ParaView build
Add VTK as separate CDAT module
Update PYTHONPATH to include VTK python classes
Turn CDAT_BUILD_PARALLEL off by default
Only build ParaView if CDAT_BUILD_PARALLEL is enabled

If not just build VTK
The <pkg_name>_pkg variable needs to be set in add_cdat_package_dependent

<pkg_name>_pkg was only set in add_cdat_package(...) however, some
calls to add_cdat_package_dependent(...) never make it into
add_cdat_package(...) so set the variable up in
add_cdat_package_dependent(...) as well.
Pass path the built yasm to ffmpeg build

Ensure ffmpeg uses built version of yasm if we are building it.
Fix package order

Make sure dependent packages are included in the correct order.
WIP: Need to check this change???
Turn off all modules by default

Rely on dependencies to turn on the modules require to support
CDAT and VisTrails.
CDAT_USE_SYSTEM_pkgconfig => CDAT_USE_SYSTEM_PKGCONFIG

The package name should be uppercase.
VisTrails needs Cython
Include Python package before VTK
SCIPY is needed by CDAT
Pass Python version to VTK build
Pass system lapack and blas directories to SCIPY
Correct case of VTK_deps
Only enable the VTK modules we need
Fixed bug related to package not getting enabled at the secondary level

If package A dependent on B and B if OFF, B will be turned ON if
A is ON but now we to have to recursively turn ON the dependencies
of B as well
Genutil requires udunits