libpng deletion and libpng3 -> libpng renaming

[Lucas Nussbaum]

Hi,

I noticed that the libpng source package was removed in Debian, and that
the libpng3 source package was removed to libpng. Ubuntu Dapper still
has libpng3 and libpng.

Maybe an ubuntu-core-dev could fix this and rebuild the necessary
packages ? It's better to avoid source package name differences between
Ubuntu and Debian since it makes it hard to track changes.
-- 
| Lucas Nussbaum
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