(ProjFrame.__ShowError): Consolidate error dialogs into a single method call.
(ProjFrame.__VerifyButtons): Add more states to check.
(ProjFrame.__GetProjection): Return the current state of an
edited projection or None.
(ProjFrame.__FillAvailList): Remove checks for states that shouldn't exist.
(ProjFrame._OnNew): Clear all selected items and supply
a projection panel if necessary.
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trunk/thuban/Thuban/UI/projdialog.py