Note: Deal Collateral is only released and returned to clients and miners
when the storage deal stops counting towards power. In the current iteration,
it will be released when the sector containing the storage deals expires,
even though some storage deals can expire earlier than the sector does.
Collaterals are denominated in PerEpoch to incur a cost for self dealing or
minimal deals that last for a long time.
Note: ClientCollateralPerEpoch may not be needed and removed pending future confirmation.
There will be a Minimum value for both client and provider deal collateral.