wallet: walk the chain for coins a key owns but the wallet never saw (#88)

A transaction only entered the wallet when its block arrived over the network,
so a key added afterwards was invisible: coins on the chain, private key in
wallet.dat, balance zero. /importwallet has always ended that way -- it writes
the keys and the money never shows up, which looks exactly like a failed import.

ScanForWalletTransactions walks the main chain and hands every transaction that
IsMine() to AddToWalletIfMine, the same two primitives the live path uses. Wired
into /importwallet, and offered as /rescan.

It is also the half that any recovery-phrase feature has to stand on: deriving
keys from twelve words is easy, and without this a restore restores nothing.

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