[rfc][icedtea-web] in cae of exisitn human readable form, put url to brackets instead of ignoring human readable form

[Jiri Vanek]

This simple patch is trying to fix one of the rebuke  to document generator impl :
  When <A HREF=URL>text</A> was used in plain/man formater, then it translated to URL appearence 
only. Which in sentence, which in html looked fine like "text" , appeared really wrongly.

After this patch it shoudl appear like "text (url)"

Small workaround was added for urls with no human-readable-substitution, to dont have empty brackets 
over docs.


How do you feel with this?

I remember Jie liked this approach...O:)
  J.
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