- this is a major refactor of the code and may have broken some behavior
in the wallet or witness nodes.
- this commit changes the serialization of operations
- the chain_tests pass
This logic was previously located in limit_order_create_evaluator, but
other code may need it in the future, so it should be made available at
the database level.
Core exchange rate is now redundantly stored in price feed for
bitassets, and updated when the median feed changes. This allows feed
producers to update the core exchange rate. Redundant storage is
necessary, because the core exchange rate is needed for user-issued
assets as well as market issued assets.
