Keep new phrase addresses recoverable (#102)

-newphrase installed a seed but left the wallet's visible address as the pre-seed random key and the old random pool intact, so the next address handed out -- a mining payout included -- could be one the twelve words cannot reproduce, while the window said a recovery phrase existed. Installing a phrase now clears the stale pool records (private keys stay in wallet.dat), reserves a derived default receiving key, tolerates already-stored derived keys so repeated installs do not stall the pool, and -restorephrase reports what it recovered rather than the wallet's total transaction count. Self-test covers installing a phrase over a pre-existing random pool.

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