r580 release

Alright! r580 it is! ... just 'cuz I have to say STOP! at some point, actually.

All things considered, r580 should be a more usable and more robust release than most earlier ones. Apart from the usual features and bug fixes, the examples have also been updated to this release and placed in the trunk folder along with the source code for added convenience.

For details, see the AboutRelease580 wiki page.