Early release of SBOL Utilities with three utilities:
- `graph-sbol` uses graphviz to render the object tree in an SBOL Document.
- `excel-to-sbol` extracts SBOL parts and libraries from an Excel file (an SBOL3 version of the [SBOL2 Excel-to-SBOL utility](https://github.com/SynBioDex/Excel-to-SBOL))
- `sbol-expand-derivations` searches through an SBOL file for CombinatorialDerivation objects and expands them to create a library of all of the specific constructs.
New this release:
- faster term lookups
- generated collection displayIDs exposed as constants
- backbone/locus column can be combinatorial
- refer to parts by either displayID or name
- allow imported parts to retain source URI rather than forcing reminting
- helper functions for sequence alphabet validation