* revert confirmations to its original meaning ("Blockchain Confirmations") and also remove bcconfirmations completely
* add new field instantlock (bool) to the RPC output of gettransaction, listtransactions and listsinceblock commands to indicate that tx was locked via InstantSend
* add optional `addlockconf` in addition to `minconf` parameter to all the commands where it makes sense
* fix `wallet.py` test and `vRPCConvertParams` set
* add addlockconf parameter for listreceivedbyaccount/listreceivedbyaddress commands
- [qa] Cleanup wallet.py test
- [qa] check if wallet or blochchain maintenance changes the balance
- [walletdb] Add missing LOCK() in Recover() for dummyWallet
Github-Pull: #7229
Rebased-From: fa0765d433fa14d99484fa33d9740c
Adds a regression test for the wallet's ResendWalletTransactions function, which uses a new, hidden RPC command "resendwallettransactions."
I refactored main's Broadcast signal so it is passed the best-block time, which let me remove a global variable shared between main.cpp and the wallet (nTimeBestReceived).
I also manually tested the "rebroadcast unconfirmed every half hour or so" functionality by:
1. Running bitcoind -connect=0.0.0.0:8333
2. Creating a couple of send-to-self transactions
3. Connect to a peer using -addnode
4. Waited a while, monitoring debug.log, until I see:
```2015-03-23 18:48:10 ResendWalletTransactions: rebroadcast 2 unconfirmed transactions```
One last change: don't bother putting ResendWalletTransactions messages in debug.log unless unconfirmed transactions were actually rebroadcast.
