new rl_full_quoting_desired application-settable variable; repeated invocations of...

new rl_full_quoting_desired application-settable variable; repeated invocations of vi-yank-pop now cycle through the kill ring; fix some uninitialized variable problems; fix some small memory leaks; better deallocation when completion is interrupted; don't print signal chars in callback mode by default; don't compile in obsolete typedefs by default