Update CarbonTracker contract and documentation

hyperledger-labs / blockchain-carbon-accounting

This project implements blockchain applications for climate action and accounting, including emissions calculations, carbon trading, and validation of climate claims. It is part of the Linux Foundation's Hyperledger Climate Action and Accounting SIG.

Apache License 2.0

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Revisions/fixes to contract functions.

trackee must be registered industry of NET network
simplify productBalance
Drop sourceTrackerId mapping. Product's sourceTrackerId is defined in _productData[productId].trackerId
productTransfer() modified

Drop function transferProductToTracker(). Superceeded by transferProduct and trackProduct() functions.

Owner of audited CarbonTracker contract can transferProduct() to new trackee address.
- Trackee can trackProduct() received to a new carbon tracker assigned to them.

Updated documentation and add diagram to docs/carbon-tracker.md.

hyperledger-labs / blockchain-carbon-accounting

Update CarbonTracker contract and documentation #623