patch to optionally relax paren expression handling

[matthew green]

   > 2000-06-23  matthew green  <mrg@redhat.com>
   > 
   >         * expr.c (operand): Do not as_bad() if RELAX_PAREN_GROUPING is
   > 	defined.  Fix error message for `[' grouping.
   
   Committed.  Thanks for fixing the double increment of input_line_pointer
   too.

actually, that one got me too -- it wasn't double increment due to
&& and || short-cuts!  at least this way is much clearer.


thanks!