- added CFA cpu usage discount
 - added max transaction net and cpu usage
 - refactored trace data structures to resolve cyclic dependencies in header files
 - refactored accounting code in chain controller for a little more clarity
 - refactored lock processing and put them in the associated block/transaction traces

From a script by @joneric.

abi for eosio.system contract, draft of unit-test, get_blockchain_parameters API function, asset switched to signed int64_t, fixes

added tests for the WASM currency contract and fixed issues it exposed, refactored contract initialization as a require_recipient where the logic of init vs apply is now in the wasm_interface

account => key
amount => quantity

* Fix currency.abi / exchange.abi / proxi.abi

- support fetching tables
- update readme to show fetching tables
- support multiple scopes with -S
- changed docs to use long args rather than short
- implement wast_to_wasm and wasm_to_wast
- support fetching code and abi from blockchain with eosc
- update definition of abi for currency contact
- add extra meta info to Abi type to describe tables

- added account fetching in CLI
- added currency.abi file describing currency contract's ABI