New digikam and kipi-plugins 1.8.0

Another month, another bugfix release from the digiKam team, and it's already in the tree. Enjoy, and remember, this all needs at least KDE 4.5!

As a side note, please don't expect any working ebuilds for digikam-2.0.0_beta1. First, the great new upstream feature is bundling of all the required libraries, including even some pre-release of kdegraphics-4.7(!). Several maintainers have already pointed out that this is not such a great idea, with no effect so far... Second, the entire source tree layout may still change until 2.0.0 release, so this is a bit like chasing a butterfly...