git-annex (but not git-annex-shell) supports the git help.autocorrect
configuration setting, doing fuzzy matching using the restricted
Damerau-Levenshtein edit distance, just as git does. This adds a build
dependency on the haskell edit-distance library.
* git-annex now behaves as git-annex-shell if symlinked to and run by that
name. The Makefile sets this up, saving some 8 mb of installed size.
* git-union-merge is a demo program, so it is no longer built by default.