added additional_height option #18

Job	Run time
get_tests	4s
run_tests (test/dprf_flow_test.py)	4s
run_tests (test/flow_test.py)	5s
run_tests (test/lef_exporter_test.py)	5s
run_tests (test/macro_dim_test.py)	4s
run_tests (test/factory_base_test.py)	6s
run_tests (test/memory_config_test.py)	4s
run_tests (test/physical_test.py)	4s
run_tests (test/process_test.py)	4s
run_tests (test/dpsram_flow_test.py)	4s
run_tests (test/memory_factory_test.py)	4s
run_tests (test/memory_test.py)	7s
run_tests (test/timing_data_test.py)	6s
run_tests (test/sprf_flow_test.py)	5s
run_tests (test/spsram_flow_test.py)	4s
run_tests (test/sv_bbox_test.py)	4s
	1m 14s

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