#418 Change dialogs so they're not destroyed

[Curt Mills]

When changing some major feature of a dialog, change
the code so that the entire dialog is not
destroyed/recreated, as this operation usually causes
the dialog to resize and reposition. Instead just
change the widgets necessary and leave the major part
of the dialog alone.

Dialogs that definitely need to be changed:

View->Message Traffic
View->Bulletins
Station Info - Enable Automatic Updates
Create Object/Item

[Rodney Baker VK5ZTV]

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I have just added a new feature request no. 1558553 which
may be related to this one...vk5ztv