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<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/111|#111 Klayout PyCell integration>
Pull request opened by <https://github.com/ThomasZecha|ThomasZecha>
-adjusted layer purpose numbers according to layer properties from sg13g2.lyp  
-verified sealring against virtuoso Pcell layout counterpart  
-introduced stack-based PyCell-contexts for hierarchicaly layouts  
-added partial implementation for PyCell-API class Instance  
-added partial implementation for PyCell-API class ParamArray  
-added API documentation stuff, updated pdf documentation  
-added support for layer-properties read from lyp-files  
-added support for npn13G2
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>
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<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/111|#111 Klayout PyCell integration>
Pull request merged by <https://github.com/sergeiandreyev|sergeiandreyev>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>

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