Legend shows layers that are not initially visible as checked.

[chrisclaydon]

In MapGuide it is possible to specify, in a map definition, whether a layer is initially displayed in the map. In MG Studio, for example, this is configured using the "Layer is initially displayed in the map" checkbox in the map editor.

When the map is loaded in a Fusion application, the legend displays the layer as checked. A layer that is not initially visible will still not be rendered initially, but the checkbox is misleading, and must be un-checked and re-checked in order to get the layer to show up.

[madair]

(In [1685]) closes #168: convert true/false strings from LoadMap? into booleans; add missing checkbox handler for initially out-of-scale layers