Change local variable classprefix to buildSpan

A function used to build a span with or without a closing tag.
Translate use of classprefix over to buildSpan
Move compatible documentation over to CHANGES
Change docs of compatibilityMode to classPrefix
Add a hljs class to tag that is being highlighted

This to address issues with custom initialization not having the styling
included in the themes, mentioned in #147.
Change pre code over to the hljs class
Fix display of test results
Fix broken urls from mismatched macros
Fix another macro messup