[wwwdocs] Add "free software" instead of "Open Source" to codingconventions.html

[Gerald Pfeifer]

This came up in a recent conversation with RMS, and it certainly is
a key element for us to document.

I'll also do some grep-ing to fix up a few occurrences that may have
sneaked in...

Gerald

Index: codingconventions.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/codingconventions.html,v
retrieving revision 1.55
diff -u -3 -p -r1.55 codingconventions.html
--- codingconventions.html	30 Dec 2008 09:51:21 -0000	1.55
+++ codingconventions.html	31 Dec 2008 08:34:41 -0000
@@ -290,6 +290,10 @@ and code.  The following table lists som
     <td>Established convention</td>
   </tr>
   <tr>
+    <td>"free software" or just "free"</td>
+    <td>"Open Source" or "OpenSource"</td>
+  </tr>
+  <tr>
     <td>"front end" (noun)</td>
     <td>"front-end" or "frontend"</td>
     <td></td>