This makes it easier to jump to the definition of a procedure or
variable when looking at a code snippet. There can be false-positive
because scoping rules are ignored, for example, but it should be a good
approximation.
* doc/build.scm (syntax-highlighted-html)[build](highlights->sxml*): Add
'anchors' parameter. Add clause for ('symbol text).
(syntax-highlight): Add 'anchors' parameter. Wrap body in named let and
use it in recursive calls. Pass ANCHORS to 'highlights->sxml*'.
(underscore-decode, anchor-id->key, collect-anchors, html?): New procedures.
(process-file): Add 'anchors' parameter. and honor it.
Rewrite mono-node and multi-node HTML files separately.
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