Update GRDBProfiling app to block-based database accesses.
Update GRDBProfiling app to block-based database accesses.

zmeyc/GRDB.swift,groue/GRDB.swift,zmeyc/GRDB.swift,zmeyc/GRDB.swift,groue/GRDB.swift,zmeyc/GRDB.swift,groue/GRDB.swift,groue/GRDB.swift