Change GraphID numbering to be zero-based

b_asic/signal_flow_graph.py

examples/firstorderiirfilter.py

examples/fivepointwinograddft.py

examples/folding_example_with_architecture.py

examples/secondorderdirectformiir_architecture.py

examples/threepointwinograddft.py

examples/twotapfirsfg.py

test/baseline/test__get_figure_no_execution_times.png

test/baseline/test_draw_matrix_transposer_4.png

test/baseline/test_draw_process_collection.png

test/baseline/test_left_edge_cell_assignment.png

test/fixtures/schedule.py

test/test_architecture.py

test/test_graph_id_generator.py

test/test_process.py

test/test_schedule.py

test/test_sfg.py

test/test_simulation.py