capturing logoutput from *all* domains

[Stefan Kost <kost imn htwk-leipzig de>]

please fogive me if I am too blind to see it, but how can I capture all
logoutput that goes over glib-log functions.
I currently use g_log_set_handler for the domains I know the name (e.g. GLib,
GLib-GObject,..). I've also set a printerr_handler.

I need this to
a.) post-process message in unit-tests (see thread about g_assert-handler)
b.) avoid output in (n)curses based application

Stefan
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