htags: status line could show better status line

[Yann Dirson - LOGATIQUE]

Currently when the pointer is over a href in a htags hypertext, the status
line does its default and displays the URL pointed to.  Unfortunately this
is not at all informative.  What would be better would be:

* filename + lineno if target is a program line
* things like "References to <symbol>" or "Uses of <symbol>" when relevant

Best regards,
-- 
      /\       Yann Dirson                      <address@hidden>
     \\ \
    \ \\ /     Sun Microsystems Inc.               <http://www.sun.com/>
   / \/ / /    ChorusOS Support
  / /   \//\
  \//\   / /   Phone: +33 139 44 74 50
   / / /\ /    Phone: 44450           
    / \\ \
     \ \\
      \/       Subcontractant from Logatique  <http://www.logatique.fr/>