This mostly changes http: to https: in URLs.  It also updates
some URLs that have moved, removes some URLs that no longer
work, recommends against using procmail (procmail.org no
longer works), and removes some mentions of the
no-longer-existing Gmane, LPF and VTW.
It doesn't update all URLs, just the ones I had time for.
* GNUmakefile (help):
* admin/admin.el (manual-doctype-string):
* admin/charsets/Makefile.in (${charsetdir}/ALTERNATIVNYJ.map):
* admin/charsets/mapconv:
* lisp/net/soap-client.el (soap-create-envelope):
* lisp/org/org.el (org-doi-server-url):
* lisp/textmodes/bibtex.el (bibtex-generate-url-list):
Prefer https: to http: un URLs.

* lisp/vc/diff-mode.el (diff-find-source-location): Fix docstring.

* lisp/vc/add-log.el (change-log-unindented-file-names-re)
(change-log-read-entries, change-log-read-defuns)
(change-log-insert-entries):
* lisp/vc/diff-mode.el (diff-add-log-current-defuns):
* lisp/vc/log-edit.el (log-edit--insert-filled-defuns)
(log-edit-fill-entry): New functions.
(log-edit-mode): Set `log-edit-fill-entry' as
`fill-paragraph-function'.
(log-edit-generate-changelog-from-diff): New command.
(log-edit-mode-map): Bind it to C-c C-w.
* doc/emacs/maintaining.texi (Types of Log File, Log Buffer):
* CONTRIBUTE: Document it.
* etc/NEWS: Announce it.
* test/lisp/vc/log-edit-tests.el (log-edit-fill-entry)
(log-edit-fill-entry-joining): New tests.

818a68b * etc/HISTORY: Update for Emacs 26.2 release.
e04aa5a ; ChangeLog.3 update
8297e97 * etc/AUTHORS: Update.
8582936 Improve documentation of 'read-command'
dc81c05 ; * CONTRIBUTE: Mention where to ask for the copyright assign...
b77723a Fix an outdated URL in a comment

* CONTRIBUTE: A message shall contain the string "[PATCH]" in the
subject if there's a patch in the message.

* doc/misc/vhdl-mode.texi (Custom Indentation Functions):
* doc/misc/url.texi (Customization):
* doc/misc/tramp.texi (Overview):
* doc/misc/srecode.texi (Developing Template Functions):
* doc/misc/sieve.texi (Sieve Mode):
* doc/misc/reftex.texi (Options - Creating Citations):
* doc/misc/org.texi (Cooperation, Conflicts):
* doc/misc/gnus.texi (Misc Group Stuff):
* doc/misc/eshell.texi (Bugs and ideas):
* doc/misc/calc.texi (Summary):
* doc/man/emacsclient.1:
* doc/lispref/os.texi (Security Considerations):
* doc/lispref/control.texi (pcase Macro):
* CONTRIBUTE: Fix typos.  Reported by Mak Kolybabi
<mak@kolybabi.com>  (Bug#32853)