* Make configuration able to prevent dpkg-mergechangelogs setup.
* Provide dgit setup-new-tree (like dpkg-setup-mergechangelogs
but only does it if not disabled in config).
+ * Set up git user.email and user.name from distro access config
+ or DEBEMAIL/DEBFULLNAME. Closes:#793410.
+ * Work around curl -sS -I printing `HTTP/1.0 200 Connection established'
+ before the actual header, so dgit works with https_proxy set (!)
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