Replace <lj-cut> with Dreamwidth's <cut>.


git-svn-id: svn://svn.tartarus.org/sgt@10292 cda61777-01e9-0310-a592-d414129be87e
Support {pi} as a special character.


git-svn-id: svn://svn.tartarus.org/sgt@10293 cda61777-01e9-0310-a592-d414129be87e