Fixed generator segfaults on OS X 10.6. Regarding the change to dgenerator.cpp, I am not actually sure if 0 is the correct value to pass, but it seems to work and the code which had been there before was just plain incorrect ? it read past the list boundaries.

#! /bin/bash

dmd main.d graphwidget.d node.d edge.d -L-lqtdgui -L-lqtdcore -L-lcpp_core -L-lcpp_gui -L-lQtGui -L-lQtCore -ofelasticnodes