Woolz: make sure the service is initialized when calling openBytes

If planes are being opened after initialization from a memo file, the service may not have been
set up.  This attempts service initialization any time the service is null during an openBytes call.
Merge pull request #983 from melissalinkert/rebased/develop/wlz-openbytes

Woolz: make sure the service is initialized when calling openBytes (rebased onto develop)