This patch was implemented via the following shell commands:
find * -name ChangeLog |
sed 's,.*,git mv & &.1,
s, lisp/ChangeLog\.1$, lisp/ChangeLog.17,
s, lisp/erc/ChangeLog\.1$, lisp/erc/ChangeLog.09,
s, lisp/gnus/ChangeLog\.1$, lisp/gnus/ChangeLog.3,
s, lisp/mh-e/ChangeLog\.1$, lisp/mh-e/ChangeLog.2,
s, src/ChangeLog\.1$, src/ChangeLog.13,' |
sh
git commit -am"[this commit message]"

* progmodes/cc-mode.el (c-common-init): bind
\(before\|after\)-change-functions to nil around invocations of
c-get-state-before-change-functions and
c-before-font-lock-functions to prevent recursive invocations.
(c-neutralize-syntax-in-and-mark-CPP): On c-beginning-of-macro,
check that point has actually moved back.
(c-fl-decl-start): Check whether c-beginning-of-decl-1 has
actually found a boundary (as contrasted with hitting a search
limit).

cc-mode.el (c-font-lock-init): Setq font-lock-extend-region-functions to
nil.

Fixes: debbugs:19736

* lisp/progmodes/python.el (python-shell-completion-setup-code):
Cleaner setup; import rlcompleter as last resource.

(package-menu--list-to-prompt): New function.
(package-menu--prompt-transaction-p): Use "Upgrade" to make the
package-menu-execute prompt less verbose.

(package-menu--new-package-list)
(package-menu--old-archive-contents): No longer local.

Most install/delete logic is now in
`package-menu--perform-transaction', and this function is called
asynchronously if `package-menu-async' is non-nil.