formatting changes

* data/c.m4: Fix comments, put macros in a more natural order.
Space changes (from M-x whitespace-cleanup).
* src/location.c: Fix spaces.
* tests/actions.at: Space changes.

tests/actions.at

@@ -365,7 +365,7 @@ input:
       V(input, $$, @$, ": /* Nothing */\n");
     }
 | line input /* Right recursive to load the stack so that popping at
-		END can	be exercised.  */
+                END can be exercised.  */
     {
       $$ = 2;
       V(input, $$, @$, ": ");