Add getaccount RPC command.
Add getaccount RPC command.

jrick/btcwallet,Roasbeef/btcwallet,decred/dcrwallet,jrick/dcrwallet,btcsuite/btcwallet,btcsuite/btcwallet,decred/dcrwallet,Stash-Crypto/btcwallet,synrg-labs/btcwallet,Roasbeef/btcwallet,jrick/btcwallet,Stash-Crypto/btcwallet,synrg-labs/btcwallet,jrick/dcrwallet