2004-04-21  Daniel Elstner  <daniel.elstner@gmx.net>

	* tools/m4/convert_gconfmm.m4: Make _CONVERSION() from GConfValue*
	to const Value& take a copy.  This fixes a crash caused by double
	destruction of the value argument to Client::signal_value_changed().
	Changing a global conversion for this is kinda fragile, but that's
	a design problem of gtkmmproc; fortunately no other code is using
	this particular conversion.