Added replace for SubnetView.
In the current version SubnetView must:
1. Contain iomapping to the parent (SubnetID or SubnetBuilder) PIs and POs.
2. Be fanout free view.
Mapping to inner cells is not allowed.
Edited by Ершов Михаил Алексеевич
In the current version SubnetView must:
1. Contain iomapping to the parent (SubnetID or SubnetBuilder) PIs and POs.
2. Be fanout free view.
Mapping to inner cells is not allowed.