* change-history-template.html:  Times are PST/PDT

Update the email address in signature blocks

* bob/damon-mahler.html, bob/index.html, bob/resume.html:
* change-history-template.html, climbing/directions.html:
* climbing/index.html, climbing/tuesday-faq.html:
* climbing/tuesday-night.html, emacs/index.html, hits.html:
* linux/backup.html, linux/cd-burning.html, linux/disk-upgrade.html:
* linux/ether.html, linux/howto.html, linux/index.html, linux/nis.html:
* linux/ntp.html, linux/tmda.html, linux/xml.html:
* linux/security/firewall.html, linux/security/index.html:
* linux/security/xauth.html, lisp/index.html, perl/index.html, ra.cgi:
* site-map.html, web-site.html:
   + Update the address.
* bob/contact.html:
   + Also, drop mention of the landline, and the "alternative" email
     address.
* bob/resume-extra.html, linux/security/ssh.html:
   + Also, update the signature block more generally.

Update for the move

* index.html:
   + Change the city, add Sourcehut, plus a few other tweaks.

* climbing/index.html:
   + Correct the MetroRock link.

* index.html:
   + Trivial markup change to test-drive a new html-helper-mode
     version.

* makefile:
   + Oops; fix makefile boo-boo.

* makefile:
   + (climbing-pages):  Add climbing/gym-to-crag-faq.html to this macro.

* climbing/gym-to-crag-faq.html (added):
   + First draft for the AMC 2021 weekend on September 18-19.

* site-map.html:
   + Improve the Linux section, and move it higher.
   + Restore the (small) Common Lisp section.

* linux/backup.html:
   + Update the backup.pl synopsis.

* site-map.html:
   + Update this.

* free-clim/ex-0306-4.html (removed), free-clim/index.html (removed):
   + Get rid of this unused/unreferenced stuff.

* visitors.html (removed):
   + This is much too out of date.
* makefile:
   + Remove visitors.html from the top-pages macro.
* web-site.html, site-map.html:
   + Remove a link to visitors.html.

* climbing/index.html:
   + Update gym information.
   + Remove the MITOC link, since they no longer have the "sitemap" page
     with pointers to other resources.
   + Update weather links.

* linux/howto.html:
   + Remove the old "boot recovery" recipe, which only applied when the
     system was the firewall/router.
   + Remove the Samba stuff.
   + Remove dead RPM and XFree86 links.
   + Add a caveat about old Zip and floppy drive info.
   + Plus other changes to bring this more up to date.

* site-map.html, linux/howto.html, linux/index.html:
   + Remove security/ links, since I don't seem to have anything current
     to say on these pages.
* makefile:
   + Remove the security-pages macro.

* linux/backup.html:
   + Add a level 2 tar dump, plus further corrections.

* makefile:
   + Remove the perl-pages macro.

* change-history-template.html:
   + Remove another rogue Subversion reference.
   + Times are UTC.

* linux/backup.html:
   + Correct some problems with the description of tar backups.