Main issue: universal DRC scheme and rectangle filtering/opposite filtering/shielding.
The space function required some enhancements to accomodate symmetric interactions.
Now there are symmetric edge pairs. Space initially runs twofold (primary to foreign)
but produces symmetric edge pairs. These are filtered later unless converted before.
- Include a copy of the unit test framework so we're no longer
depending on incompatible versions for Ruby 1 and 2.
- Avoid duplication of path entries in unit tests
RBA now provides a hash method for Box, Edge, EdgePair, Trans,
Polygon, SimplePolygon, CellInstArray, LayerInfo, Path, Text,
Point and Vector.
eql? is mapped to ==.
==, != and < act "fuzzy" for the double-typed variants.
Hence, these objects can be used as hash keys now.