Start for some asciidoc enhancements, incl. links in source code frag…

[svenreimers]

…ments

[svenreimers]

Hope this makes sense...

[vieiro]

Hi @svenreimers . Does this work?

I think the [source, java, subs="macros"] should allow using the "link:" macro in source code blocks. Maybe you cant to give it a try?

Thanks, Antonio