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Create a Proposal

function createProposal(address to, uint tokens, bytes metadataHash) public;
Creates a proposal to send the given amount of tokens to the given address, with details about the request in the metadataHash.
Emits the following event:
event ProposalCreated(uint proposalID, address proposer, address to, uint tokens, bytes metadataHash);
Return value: the identifier of the request being made, specified by requestID.