untagged-09cfd99b36c98da5c708: background image on frontpage fullscreen

somehow paperwidth is not enough for scale, so just added 1.1 as a scale
factor

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added text about varing scale value in some formulas

untagged-c8ce851b6091400d4dd2: fix non existing roboto font

now uses basic font lmodern with sans serif
IMHO this is easier to read

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extended opencl chapter

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some minor updating developers tex

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addition to distance estimating

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updated developers section

untagged-5b13eadd47461583236d: added chapter developers.tex

mostly copied from AddingNewFormulas.odt

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opencl chapter start

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added some words on 2D vs 3D coloring