Replace deprecated "show" calls with "setVisible".

Most of these changes are pretty straightforward; I simply replaced
calls to the deprecated “show” methods with “setVisible(true)”.

However, for the following classes, I removed the overridden (and
deprecated) show methods, added setVisible methods, and adjusted code
that called the old show methods:

ucar.unidata.idv.ui.BundleTree

ucar.visad.display.AnimationPropertiesDialog