correctly transform not applicable values for edition
Merge branch 'fix-as-uri-2.3-not-applicable' of https://github.com/TauPan/cpe into TauPan-fix-as-uri-2.3-not-applicable
Doctests moved to testfile_bugfixes.txt.
Merge branch 'TauPan-fix-as-uri-2.3-not-applicable' into develop. Closes #11