* Slurp in entire git config, for better performance.
* With -DDDD, print out all gitcfg references (copious!)
* Fix a debug message in the obsolete sshpsql archive access driver.
+ * 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).
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