This isn't normally an issue because no one in their right mind will
stick a <link> inside another <link>. However, we have entities which
create links, such as &man.*;, &a.*;, etc. It's nice to be able to
use these inside links. To deal with this..
Introduce a create-link procedure which will be used to replace (make
element gi: "A" ...) constructs. This procedure creates a link as
specified only if the can-link-here procecure (described below)
returns #t. If the latter returns #f, it will print the link text
without the link.
The (also new) can-link-here procedure returns #t if it determines
that it's okay to make a link in the current context, and #f
otherwise. Currently, it does its check by figuring out whether the
current context is within a <title> or <question> tag. This is not
ideal because it doesn't catch all cases, but it's a lot better than
nothing. As the other cases are discovered, this procedure can be
modified.
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