missing projection alert

[Bernhard Reiter]

On Tue, Dec 28, 2004 at 03:25:09PM -0500, Russell Nelson wrote:
> I have more confidence that the second patch (mainwindow.py) is
> correct.  If you have a layer whose LatLonBoundingBox returns values
> which are not legitimate latitude or longitudes, the status bar gets a
> message asking you to correct the projection.  If you load a UTM map,
> you'll get this message.

Finally could check this patch out.

Please commit, it seems fine overall.
One one question:
Could left=-180 be a valid value?
Maybe we should use <= and >= instead of < and > in the comparision.