Merge tag 'debian/5.10' into stretch-bpo

dgit release 5.10 for unstable (sid) [dgit]
[dgit distro=debian]

# gpg: Signature made Sun 15 Jul 2018 01:12:02 AM CST
# gpg:                using RSA key 559AE46C2D6B6D3265E7CBA1E3E3392348B50D39
# gpg: Can't check signature: No public key

diff --cc debian/changelog
index 2239a69b04120ff9fc404f76d5afbcbb680bd95b,762a2fe24a4fda88fc699391c8cbc0d6b99398c2..a7b12d8cb993a22be2c460b90a4bfb28ddb3eb4f
--- 1/debian/changelog
--- 2/debian/changelog
+++ b/debian/changelog
@@@ -1,9 -1,38 +1,44 @@@
+ dgit (5.10) unstable; urgency=medium
+  
+   * Merge the experimental branch.
+   * test suite: Drop a couple of useless test log output lines.
+   * infrastructure: Run git gc --auto before mirroring.  Closes:#841414.
+  
+  -- Ian Jackson <ijackson@chiark.greenend.org.uk>  Sat, 14 Jul 2018 18:07:02 +0100
+  
+ dgit (5.9+exp4) experimental; urgency=medium
+ 
+   * test suite: Use  dch -r -D sid ''  not  dch -r sid.  Closes:#903441.
+   * test suite: Save a tarball of much of the working area of each test
+     in $AUTOPKGTEST_ARTIFACTS.
+   * Separate changelog entries for the following test attempts
+     in experimental have been elided:
+       dgit (5.9+exp3) experimental; urgency=medium
+       dgit (5.9+exp2) experimental; urgency=medium
+       dgit (5.9+exp1) experimental; urgency=medium
+ 
+  -- Ian Jackson <ijackson@chiark.greenend.org.uk>  Thu, 12 Jul 2018 13:45:07 +0100
+ 
+ dgit (5.9) unstable; urgency=medium
+ 
+   * git-debrebase convert-from-gbp: Look for dgit-generated tags so we can
+     usually make the new branch ff of the dgit view.  Closes:#903132.
+   * git-debrebase convert-from-gbp: Check that the result will not
+     count as having diverged.  This will usually turn failures to make
+     the ff pseudomerge into -fdiverged.  Related to #903132.
+   * git-debrebase, Dgit.pm, git: some internal reorganisation to
+     support git-debrebase changes.
+   * dgit-downstream-dsc(7): New manpage.  Closes:#842643,#851194.
+   * git-debrebase(5): Document best gitk options.  Closes:#901927.
+ 
+  -- Ian Jackson <ijackson@chiark.greenend.org.uk>  Thu, 12 Jul 2018 13:37:12 +0100
+ 
 +dgit (5.8~bpo9+1) stretch-backports; urgency=medium
 +
 +  * Rebuild for stretch-backports.
 +
 + -- Sean Whitton <spwhitton@spwhitton.name>  Thu, 12 Jul 2018 08:33:22 +0100
 +
  dgit (5.8) unstable; urgency=medium
  
    Bugfixes: