update Makefile tree, status.html, years.html, template/README.md.year

We add `make clang-format` to the Makefile tree.

Add `important disclaimers about contest status` link to `status.html`.

Update `years.html` due to recent commit that fixed typo for abstract of 2011/akari.

Improve `template/README.md.year` for future IOCCC contents.

Ran `make quick_www` to perform the above.

status.md

@@ -2,6 +2,9 @@ Please see the
 FAQ on "[status.json fields](faq.html#status_json)"
 for more information the above JSON fields.
 
+See also the
+[important disclaimers about contest status](next/index.html#important-disclaimers-about-contest-status).
+
 
 <hr style="width:10%;text-align:left;margin-left:0">