Improve replay_chain_database test -- make it able to collect detailed statistics about the size of blockchain databases.
ifdef out the test I accidentally enabled in the last commit
blockchain_market_order_book defaults to showing only 10 orders
wallet_market_add_collateral now takes an asset string rather than a
share_type
[hardfork] Add support for bid/ask in same trx

In the event a transaction specified a bid op and an ask op at the same
time it would fail to validate because of asset opperator += mismatch.

This will hard fork in the event that someone actually creates a
transaction that does this (ie: by using the market maker bot).

This expands the set of valid transactions, but does not invalidate past
transactions.
Merge branch 'develop' into keygen
Don't skip keys for which we have a record but not the private key
Save key records for contact accounts
Bump chain db version