Also, expand the documentation in this area slightly. Closes:#768590.
* Manpages: Break out dgit(7) from dgit(1).
+ * Manpages: Other clarifications and improvements.
+ * Change realpath dependency to `coreutils (>= 8.23-1~) | realpath'
+ (Closes:#786955.)
+ * For non-Debian distros, debiantag() uses distro name a la DEP-14.
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