change error messages related to collision in help pages by a warning.

src/ar-help.c

@@ -255,13 +255,12 @@ s_register_page (const char *manpage, const char *shortdesc,
 
   if (ccl_hash_find (MAN_PAGES, page->manpage))
     {
-      ccl_error ("error: there exists two manpages with the same id '%s'.\n", 
-		 manpage);
-      ccl_error ("error: this problem is non-critical but only one page will "
-		 "be available.\n");
-      ccl_error ("error: please contact maintainers at: %s\n",
+      ccl_warning ("warning: there exists two manpages with the same id "
+		   "'%s'.\n", manpage);
+      ccl_warning ("warning: this problem is non-critical but only one page "
+		   "will be available.\n");
+      ccl_warning ("warning: please contact maintainers at: %s\n",
 		 PACKAGE_BUGREPORT);
-      
       ccl_hash_remove (MAN_PAGES);
     }