4 new commits pushed to

<https://github.com/RTimothyEdwards/open_pdks/tree/master|master>

by RTimothyEdwards

<https://github.com/RTimothyEdwards/open_pdks/commit/5f8387c1b234b39d96994ff0eb0c6f8e455f9bce|5f8387c1>

- Added a couple of missing rules to the magic tech file for sky130

<https://github.com/RTimothyEdwards/open_pdks/commit/1b72ee0351f2fef966ee268a49c6e3de9acd7b4a|1b72ee03>

- Added ptap check to the additional DRC rule in magic added in the

<https://github.com/RTimothyEdwards/open_pdks/commit/92a2c4c694987c1efa63e7c975eee526ab44dc6f|92a2c4c6>

- One additional commit to the magic tech file for sky130 to handle

<https://github.com/RTimothyEdwards/open_pdks/commit/5335458a8d5f36b01d422645db0d03155b9b9faa|5335458a>

- Corrected the check_density.py script so that it works in the RTimothyEdwards/open_pdks