TODO
2007-09-29 Implement linear package set merger.
2007-09-26 Update TODO; prune a couple of obsolete items, add a new few new.
2007-09-11 Implement property (requires/provides) to package mapping.
2007-09-06 Also import requires.
2007-09-04 Add idea for representing all files in a package set.
2007-09-03 Add TODO and .gitignore.