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

[Anton Shterenlikht]

>From woodsb02 at gmail.com Thu Jan  8 10:30:49 2015
>
>The port revision was bumped on Christmas Day for the png version update.
>However new packages are not available as the paraview port fails to build.
>
>It was marked as broken on 19th December:
>http://www.freshports.org/science/paraview

As I mentioned in another post, this is a situation
that pkgng was promised to detect and avoid.
The correct course of action is to warn
the user that after "pkg upgrade" some installed
packages will no longer work.

The whole point of pkgng is increased trust.
If I have to manually
check before each pkg upgrade what will happen
to all my installed packages, then what is the point
of a sophisticated tool like pkgng.
Or, if I have to manually roll back the ports tree
selectively and rebuild old versions of problem ports,
like png in this example, then again, what is the
point of pkgng.

I don't want to sound too critical. Up to now
I've been very happy with pkg capabilities.
I'm just surprised at today's behaviour.

Anton