HGL Suite Code

* optimizing and improved mandelbrot example
* updated debian/changelog

Mandelbrot example finalized so far

optimizing and improved mandelbrot example

mandelbrot close to final

optimizing mandelbrot

first attempt of mandelbrot example

fixed multiple doxygen runs on change of plugin.doxy

prepared mandelbrot example

and made the adaptions backward compatible

adaptions for Bison 2.7.12