layernames to physical labels dict #361

Job	Run time
test_code_coverage	8m 25s
test_code_conda	1m 57s
pre-commit	1m 14s
Test femwell on ubuntu-latest	2m 3s
Test gmsh on ubuntu-latest	2m 27s
test_docs	8m 54s
Test elmer on ubuntu-latest	1m 52s
Test meow on ubuntu-latest	3m 42s
Test sax on ubuntu-latest	1m 59s
Test tidy3d on ubuntu-latest	2m 27s
Test klayout on ubuntu-latest	1m 31s
Test vlsir on ubuntu-latest	1m 46s
	38m 17s

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