Autoreset flows

[adhusson]

Autoreset flows on update following @MathisGD's suggestion. Pros: code is simpler, one less parameter (removed resetFlow). Con: tracking flow imbalance is much harder.

For later, snippet to update flow caps without resetting the imbalance (given reference flow caps):

function updateCapsWithoutResetSnippet(FlowCaps memory oldReferenceCaps, FlowCaps memory newReferenceCaps,Id marketId) internal view returns (FlowCaps memory newCaps) {
    FlowCaps memory currentCaps = IPublicAllocator(publicAllocator).flowCaps(marketId);
    if (oldReferenceCaps.maxIn > currentCaps.maxIn) {
        newCaps.maxIn = newReferenceCaps.maxIn - (oldReferenceCaps.maxIn - currentCaps.maxIn);
    } else {
        newCaps.maxIn = newReferenceCaps.maxIn + (currentCaps.maxIn - oldReferenceCaps.maxIn);
    }

    if (oldReferenceCaps.maxOut > currentCaps.maxOut) {
        newCaps.maxOut = newReferenceCaps.maxOut - (oldReferenceCaps.maxOut - currentCaps.maxOut);
    } else {
        newCaps.maxOut = newReferenceCaps.maxOut + (currentCaps.maxOut - oldReferenceCaps.maxOut);
    }

}