This patch enhances the OpenMap Application (4.1.1).  It adds a menu item to
add new layers to the map at runtime interactively.  A framework to add any
layer type is provided, ShapeLayers in particular are supported.

The main work is done in two classes:  LayerAddPanel and Inspector, both found
in the com.bbn.openmap.gui package.  LayerAddPanel adds a menu item to the
Layers menu, which triggers a panel for interactively instantiating a Layer
object.  Inspector queries a new Layer object (actually any PropertyConsumer)
through the PropertyConsumer interface to configure it.

For details see the javadoc class documentation (might have to be rebuilt (make
docs)).

29.8.2001