Start 2.51 cycle, the first batch

Signed-off-by: Junio C Hamano <gitster@pobox.com>

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+Git v2.51 Release Notes
+=======================
+
+UI, Workflows & Features
+------------------------
+
+ * Userdiff patterns for the R language have been added.
+
+ * Documentation for "git send-email" has been updated with a bit more
+   credential helper and OAuth information.
+
+ * "git cat-file --batch" learns to understand %(objectmode) atom to
+   allow the caller to tell missing objects (due to repository
+   corruption) and submodules (whose commit objects are OK to be
+   missing) apart.
+
+ * "git diff --no-index dirA dirB" can limit the comparison with
+   pathspec at the end of the command line, just like normal "git
+   diff".
+
+
+Performance, Internal Implementation, Development Support etc.
+--------------------------------------------------------------
+
+ * "git pack-objects" learned to find delta bases from blobs at the
+   same path, using the --path-walk API.
+
+
+Fixes since v2.50
+-----------------
+
+ * A memory-leak in an error code path has been plugged.
+   (merge 7082da85cb ly/commit-graph-graph-write-leakfix later to maint).
+
+ * A memory-leak in an error code path has been plugged.
+   (merge aedebdb6b9 ly/fetch-pack-leakfix later to maint).
+
+ * Meson-based build/test framework now understands TAP output
+   generated by our tests.
+   (merge c1bc974923 ps/meson-tap-parse later to maint).
+
+ * Other code cleanup, docfix, build fix, etc.
+   (merge b257adb571 lo/my-first-ow-doc-update later to maint).
+   (merge 8b34b6a220 ly/sequencer-update-squash-is-fixup-only later to maint).
+   (merge 5dceb8bd05 ly/do-not-localize-bug-messages later to maint).