open-source-silicon.dev

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/447|#447 DRC: Update density checks>
Pull request opened by <https://github.com/akrinke|akrinke>
• checking for a density &gt;0 creates errors for empty layers
• error markers are clamped to the chip area
• new option `tiles_stay_inside` that moves tiles back into the chip  
area if they overlap the chip boundary

Fixes issuees <https://github.com/IHP-GmbH/IHP-Open-PDK/issues/391|#391> and <https://github.com/IHP-GmbH/IHP-Open-PDK/issues/404|#404>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/447|#447 DRC: Update density checks>
Pull request merged by <https://github.com/KrzysztofHerman|KrzysztofHerman>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>