[Gm2] latest CVS check in

[Gaius Mulley]

Hi,

I've just checked in some changes to gm2 which modify the behaviour of
gm2 with respect to opaque types. Previously gm2 parsed both
definition and implementation modules when an opaque type was
encountered. This allowed opaque types to be implemented as any type
(not just a POINTER TO ...). 

This feature is still present, but is now only activated via the
-Wextended-opaque switch. If this option is absent then an opaque type
will be considered to be implemented as a POINTER TO sometype
when imported.

Also included is a -Wverbose option which displays the source files
as they are parsed during pass 1.

hope this is useful,

Gaius