moved graphics generation to separate file, WARNING: may not work 100%

yet, be patient

Rev: tutorial/Gfx.pmod:1.1
Rev: tutorial/Makefile:1.36
Rev: tutorial/Wmml.pmod:1.35
Rev: tutorial/extending.wmml:1.7
Rev: tutorial/html.pike:1.30
Rev: tutorial/latex.pike:1.5
Rev: tutorial/tutorial.wmml:1.124
Rev: tutorial/wmmltohtml2:1.12