personalMint unit tests

[benjaminbollen]

• suggest where error may have been: too quick in the geometric sum
• detail more precise argument in specifications/TCIP009-demurrage.md
• calculate lookup tables 🥳 massive gas savings, script in scripts/mint_lookuptable.py
• add lookup tables to Circles.sol
• adjust calculateIssuance function
• start test framework
• write minimal unit tests

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• discover and assert numerical precision issue in converting between demurrage and inflation units.
• fix numerical precision issue #103