To bring in changes and make the interface more consistent easier.

Conflicts:
	src/lib/datasrc/database.cc
	src/lib/datasrc/database.h
	src/lib/datasrc/sqlite3_accessor.cc
	src/lib/datasrc/sqlite3_accessor.h
	src/lib/datasrc/tests/database_unittest.cc
	src/lib/datasrc/tests/sqlite3_accessor_unittest.cc