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WIP: Reworking placer1 #171
This makes several changes to placer1; bringing it closer to the algorithm described at http://www.eecg.toronto.edu/~vaughn/papers/fpga2000_arm.pdf and also working on some optimisations
The SA heuristic parameters are totally thrown off by these changes, they need fixing in order to see a QoR improvement. There may also be some performance improvements to investigate such as caching topological ordering for timing.