official amd64 pkg repo: need to rebuild paraview for png-1.6.16

[Anton Shterenlikht]

>$ pkg info -xo paraview png
>paraview-4.1.0_6               science/paraview
>linux-c6-png-1.2.49_1          graphics/linux-c6-png
>png-1.6.16                     graphics/png
>$ paraview
>Shared object "libpng15.so.15" not found, required by "libvtkIOExport-pv4.1.so.1"
>$
>
>Seems paraview should have been rebuilt for
>png-1.6.16. Some missing dependency maybe?
>

a crude workaround is:

# pwd
/usr/local/lib
# ln -s libpng16.so.16.16.0 libpng15.so.15

However, this seems to be the situation
that pkgng was specifically designed to avoid.
An update to one package breaks another.
Paraview is marked broken now, but pkg upgrade
went happily ahead and upgraded png, making
the installed paraview package unusable.
Unless this is some oversite on somebody's part,
this seems to be a flaw in pkgng design.

Anton