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Add tex-powerdot 1.5

Powerdot is a presentation class for LaTeX that allows for the
quick and easy development of professional presentations. It
comes with many tools that enhance presentations and aid the
presenter. Examples are automatic overlays, personal notes and
a handout mode. To view a presentation, DVI, PS or PDF output
can be used. A powerful template system is available to easily
develop new styles. A LyX layout file is provided.