* etc/committer.scm.in (<hunk>)[diff]: Rename this field...
[diff-lines]: ...to this.
[definition?]: New field.
(hunk->patch): Join diff lines.
(diff-info): Do not join diff lines; record whether a hunk is a new
definition.
(commit-message): Rename this procedure...
(change-commit-message): ...to this.
(add-commit-message): New procedure.
(main): Handle new package definitions before changes.
* etc/committer.scm.in (commit-message): Use EQUAL? instead of EQ? to compute
differences because not all inputs may be symbols; some could be expressions.
Ricardo Wurmus