* Cleans up existing orders on startup, in case recovering from a previous crash.
* Can now leave existing orders in place (instead of cancelling and creating fresh) if price and size are within tolerance.
* Fixes problems with liquidator re-balancing.
* Fixes problems with group-balance-wallet, group-settle, serum-buy and serum-sell commands.
* Greatly increases the speed of buying and selling on Serum - the IOC order is now placed, cranked and settled in one transaction.
* Associated token accounts and OpenOrders accounts are automatically created as-needed.
* This is a big change that touched most files in the project.
* Library code is now an actual package, in /mango.
* Pure .py files used for shared code - easier to edit/debug, and should ease move to installable package later.
* Removed many notebooks. The remaining notebooks are useful 'display'/'show' notebooks for investigating Mango objects.
* More tests! The test story is now much improved, but more unit tests are still needed.
* There's now a Makefile for project operations.
* Reduced default chunk size for AccountInfo.load_multiple() to 100 since that seems to be the limit on api.rpcpool.com.
* Added ability to pause between chunks because it really doesn't like a lot of calls in a row.
* Reverted loading of openorders for ripe margin accounts in V2 to the V1 method of fetching them all in one call, because doing it in chunks of 100 just takes too long.
* Updated notifications to allow notifying on succeeded or failed (or both!) PartialLiquidate transactions.
* Added more information to LiquidationEvent to allow that to flow through to notifications.
* ReportingAccountLiquidator wraps an AccountLiquidator but provides before-and-after logging and reporting.
* Sped up fetch_token_prices() by reducing it to one network fetch
* Centralised loading of ripe mangoes by creating MarginAccount.load_all_ripe()
* Clearer, more consistent use of Observables
* Added RxPy Backpressure library
* Improved container building to allow for different tags
Geoff Taylor