More work on market statistics reporting

Soem bugfixes on keeping the price history, and attempt to implement
volume tracking (though for some reason I'm still not getting all the
price records)
More work on price history... still doesn't work right.
Pretty print blockchain_market_order_history
Merge branch 'master' of github.com:BitShares/bitshares_toolkit
Transaction history running balance fixes
Merge branch 'master' of github.com:BitShares/bitshares_toolkit
fix formatting
update web / qt wallet
Fix blockchain_market_price_history (I think)
Merge branch 'master' of github.com:BitShares/bitshares_toolkit
Refactor wallet market order signing and caching
importing a key no longer throws an error for non-account keys
Fix market_history_key::operator<

Conflicts:
	libraries/blockchain/include/bts/blockchain/market_records.hpp
filter cover orders
Merge branch 'master' of github.com:BitShares/bitshares_toolkit
Added a new API method "execute_script" that allows "--input-log"-style scripts to be executed interactively from the CLI. It's not exactly polished right now, but it's sufficient for script debugging.
Merge branch 'dryrun9'
Fix transaction history running balance when canceling market orders
Merge branch 'master' of github.com:BitShares/bitshares_toolkit
Refactor, revamp and repair blockchain_market_order_history and pretty-

Should be OK now. Finally.