Fixes in 1986, manifest update

The html files in 1986 (including 1986/marshall/compilers.html) look and
feel good. Format change (slight) in 1986/marshall/index.html.

The manifest update includes a fix for 1986/hague and this same change
in entry_text applies to files in a few other years as well.

1986/marshall/README.md

@@ -4,7 +4,7 @@
     make all
 ```
 
-NOTE: we FORCE disable the optimiser due to a funny problem with different
+NOTE: we **FORCE** disable the optimiser due to a funny problem with different
 compilers and systems. See below and [compilers.html](compilers.html) for details.
 
 There is an [alternate version](#alternate-code). The reason is a funny problem: