My hex editor `axe' has existed in prototype for about ten years,

but since I never published it, someone else has grabbed the name
out from under me in the meantime. Hence, I'm renaming it `tweak'.

git-svn-id: svn://svn.tartarus.org/sgt/tweak@4823 cda61777-01e9-0310-a592-d414129be87e