Method initReadOnly

fdbserver/VersionedBTree.actor.cpp:663–666

A read cursor can be initialized from a pop cursor

		// A read cursor can be initialized from a pop cursor
		void initReadOnly(const Cursor& c, bool readExtents = false) {
			ASSERT(c.mode == READONLY || c.mode == POP);
			init(c.queue, READONLY, c.pageID, readExtents, false, c.endPageID, c.offset);
		}

		std::string toString() const {
			if (mode == WRITE) {