…r-hacking

This expands `close_epoch` to have most of the top-level epoch
closing logic, with most of the meat still stubbed out.

These extrinsics are really an interface to do fake borrowing/payback
until we have a borrower side to interact with. They are renamed to
indicate now that that is what they do.

This removes some confusing code where the terms `pool` or `tranche`
were being used to refer to the id in some cases but the struct data
in others. IDs are now always delimited as such

* Add Reserve

* wip: checkpoint epoch validation

* checkpoint - sub ratio validation

* checkpoint - return errors + simplify balance to perquintil conversion

* address comments 1

* address comments 2

* moved currency/tranchetoken as primitive crate

* Integrates crowdloan pallets to altait

* Pump rt-version 1005, minDep democ 1000 AIR

…e#474)

* Changed validate-unsigned

The changes to the validate unsigned are here to reflect more
detailed error messages at failure with the costum error
instead of the misleading 'BadProof' return value.

Furthermore, this fixes an issue, where somebody could have a
signature of any parachain-relay-chain account and then use
a proof of any other relay-chain contribution to gain those
rewards.

* Enable claim_reward calls

* Remove indicator for claim failures

* Epoch execution phase 1

This is the beginning of epoch execution. It updates tranche state and
stores the execution results, but since token pricing is not yet
implemented it cannot do rebalancing or other bits like that.

* Epoch close pricing calculation

This now calculates a price (including dripping
interest) for the tranches at epoch close.

There are other locations where dripping interest needs to occur, to
come in further commits.

* Store additional state at epoch close

In addition to the per-tranche supply/redeem targets for an epoch, we
now also store the nav, reserve, per-tranche price, and per-tranche
total value at the time of close.

* Update epoch validation tests for new epoch storage model

* Implement tranche rebalancing during epoch execution

This also includes a new `fake_nav` to make testing easier

* Track tranche debt/balance amounts in borrow/repay fns

* Account for updated tranche value in epoch validity

* Fixes for epoch execution / rebalancing

* Epoch execution testing

* Use a less-bad pow() impl for calculating interest

* Avoid rounding issues when round-tripping between currencies