Duck Deux

Results 11 issues of Duck Deux

When trying to print out a large overuse report (at an early iteration) we hit the assert at [`overuse_report.cpp:474` ](https://github.com/verilog-to-routing/vtr-verilog-to-routing/blob/master/vpr/src/route/overuse_report.cpp#L474). To reproduce, run `directrf` with `--max_router_iterations 10 --generate_rr_node_overuse_report on` (tested...