- students cannot add/edit/delete comments if it isn't allowed

- students can view comments if they exist
- teachers bypass the commentsallowed field always (this can be useful to create glossaries with public comments from the teacher).
- buttons are showed correctly.

Bug 1814
(http://moodle.org/bugs/bug.php?op=show&bugid=1814)

Merged from MOODLE_14_STABLE

mod/glossary/comments.php

@@ -59,7 +59,7 @@
 
     print_heading(get_string('commentson','glossary')." <b>\"$entry->concept\"</b>");
 
-    if ($glossary->allowcomments) { 
+    if ($glossary->allowcomments || isteacher($glossary->course)) { 
         print_heading("<a href=\"comment.php?id=$cm->id&eid=$entry->id\">$straddcomment</a> <img title=\"$straddcomment\" src=\"comment.gif\" height=11 width=11 border=0>");
     }