* openAPI: StorageRequestCreation: reward => pricePerByte, collateral => collateralPerByte
* purchasing: reward => pricePerByte, collateral => collateralPerByte
* Updates availabilities and reservations to use totalCollateral, minPricePerByte, and maxCollateralPerByte
* Uses correct div operator when operating on UInt256
* proposal updating totalCollateral in availability
* makes sure that reading currentCollateral happens before freeing slot
* Updates naming
* fixes tests: unit and contracts
* uses feat/price-per-byte branch for codex-contracts-eth
* temporarily disables integration tests on CI
* introduces high level <<totalCollateral>> property for a cleaner external interface
* updates integration tests
* Applies review comments
* Updates description of totalCollateral in SalesAvailability
* updates codex-contracts-eth (price-per-byte)
* convert EthersError to MarketError
* change `canReserveSlot` and `reserveSlot` parameters
Parameters for `canReserveSlot` and `reserveSlot` were changed from `SlotId` to `RequestId` and `UInt256 slotIndex`.
* Add SaleSlotReserving
Adds a new state, SaleSlotReserving, that attempts to reserve a slot before downloading.
If the slot cannot be reserved, the state moves to SaleIgnored.
On error, the state moves to SaleErrored.
SaleIgnored is also updated to pass in `reprocessSlot` and `returnBytes`, controlling the behaviour in the Sales module after the slot is ignored. This is because previously it was assumed that SaleIgnored was only reached when there was no Availability. This is no longer the case, since SaleIgnored can now be reached when a slot cannot be reserved.
* Update SalePreparing
Specify `reprocessSlot` and `returnBytes` when moving to `SaleIgnored` from `SalePreparing`.
Update tests to include test for a raised CatchableError.
* Fix unit test
* Modify `canReserveSlot` and `reverseSlot` params after rebase
* Update MockMarket with new `canReserveSlot` and `reserveSlot` params
* fix after rebase
also bump codex-contracts-eth to master
