AG_TAILQ_HEAD macros

Hello,

In Agar-1.3.4, in agar/core/class.h line 39 (line 40 in current SVN) the 
AG_TAILQ_HEAD macro has no first argument specified, which makes gcc 
(version 4.4.1 on Ubuntu, with some warnings enabled) complain:

'''error: invoking macro AG_TAILQ_HEAD argument 1: empty macro arguments 
are undefined in ISO C90 and ISO C++98"

This is true also for:
 - agar/core/object.h line 62, 63 and 68
 - agar/core/dso.h line 20
 - agar/gui/widget.h line 98
 - window.h line 94
 - label.h line 65
 - tlist.h line 72
 - file_dlg.h line 47, 78
 - graph.h line 79, 80
 - notebook.h line 43

Same thing for the AG_SLIST_HEAD macro:
 - table.h line 147
 - text_cache.h line 14

Finally, in agar/gui/graph.h, in the ag_graph_vertex_style enum there is 
a comma after AG_GRAPH_CIRCLE which should preferably be removed 
(otherwise: "error: comma at end of enumerator list").

Could all these minor points be fixed? I am volunteering to test any 
pre-release of Agar archive, to iron out these small compilation issues, 
if it can help.

Thanks in advance,
Best regards,

Olivier Boudeville.