* Work around #793471 (madness with $SIG{__WARN__} and Perl's system
builtin): move $SIG{} setting into setup_sigwarn in Dgit.pm, and
check getppid.
+ * Make warnings fatal in dpkg-repos-admin-debian, dgit-ssh-dispatch
+ (using setup_sigwarn).
+ * Make warnings fatal in tstunt/dpkg-parsechangelog (directly).
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