Added documentation directory, and a class/layer overview diagram.
Added documentation directory, and a class/layer overview diagram.

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extra : convert_revision : svn%3A8664401c-e8a0-11dd-9059-71fac19e68c6/trunk%40110

aufflick/core-plot,aufflick/core-plot,aufflick/core-plot,aufflick/core-plot,aufflick/core-plot