PLTM is the home for our token code and the liquid democracy protocol it uses.
PLTM is the token that governs Plutum, our core protocol that enables PNFT creation and transaction.
If you would like to learn more, check the info repository and our documentation - "What is PLTM?" describes PLTM and its differences from Plutum.
PLTMproposal.sol is deprecatred; in the latest verison of the token code, all functionality is included in the base ERC-20 contract.