Revert "Add fOnlySpendable parameter to AvailableCoins(), allows filtering out watchonly coins"

This reverts commit 8ebd9b64a8974d2fbc47fffdef5dbd72d3860a37.
Revert "Add support for watch-only addresses"

This reverts commit a5b3413d058539df681b24440c5a03104110cea1.

Conflicts:
	src/wallet.cpp
Fix alert test
Protocol version is now 70002. So 70001 alerts no longer apply to us. But the test is still testing the alert notify behavior correctly because there is still one alert that applies.