* Updates to symbolic refs can now be made as a part of ref
transaction.
+ * The trailer API has been reshuffled a bit.
+
Performance, Internal Implementation, Development Support etc.
the wrong order almost consistently, which has been corrected.
(merge f01301aabe jc/compat-regex-calloc-fix later to maint).
+ * Expose "name conflict" error when a ref creation fails due to D/F
+ conflict in the ref namespace, to improve an error message given by
+ "git fetch".
+ (merge 9339fca23e it/refs-name-conflict later to maint).
+
* Other code cleanup, docfix, build fix, etc.
(merge 4cf6e7bf5e jt/doc-submitting-rerolled-series later to maint).
(merge a5a4cb7b27 rs/diff-parseopts-cleanup later to maint).
(merge 55702c543e fa/p4-error later to maint).
(merge 2566a77774 vd/doc-merge-tree-x-option later to maint).
(merge b64b0df9da ds/scalar-reconfigure-all-fix later to maint).
+ (merge c81ffcff83 dm/update-index-doc-fix later to maint).
+ (merge fc0202b0e9 dg/fetch-pack-code-cleanup later to maint).