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Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November.  Change these FTP URLs to https://ftp.gnu.org
instead.  Make similar changes for URLs to other organizations moving
away from FTP.  Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.

The security patches released for Emacs 25.3 were less drastic
than what we had immediately put into master.  Adjust master to
match 25.3 (Bug#28350).
* lisp/textmodes/enriched.el (enriched-translations):
Re-enable FUNCTION and display translations that are safe.
(enriched-handle-display-prop): Bring back.
(enriched-decode-display-prop): Bring back, but disable
the unsafe part.

* README: Set Emacs version to 25.2.
* etc/HISTORY: Add release log.
* lisp/ldefs-boot.el:
* etc/AUTHORS:
* ChangeLog.2: Update.

* README:
* configure.ac:
* msdos/sed2v2.inp:
* nt/README.W32: Bump Emacs version.
* lisp/ldefs-boot.el: Update.

* etc/HISTORY: Add more release information about 19.x and 20.x
versions.

* admin/FOR-RELEASE: Procedure for etc/HISTORY.
* etc/HISTORY: New file.
* etc/NEWS: Mention it.