Add superscript-minus to my compose configuration.


git-svn-id: svn://svn.tartarus.org/sgt@10195 cda61777-01e9-0310-a592-d414129be87e
Compose sequences for o-double-acute.


git-svn-id: svn://svn.tartarus.org/sgt@10198 cda61777-01e9-0310-a592-d414129be87e