Avoid view-manager returning default SGGeod

- when switching views, force an update() to ensure view position
  is valid. Otherwise various subsystems such as AI traffic and the
  tile manager see a request for a 0,0 location.

- when switching to model view, we still generate a 0,0
  location initially - to be fixed.

src/Viewer/viewmgr.cxx

@@ -139,6 +139,14 @@ FGViewMgr::init ()
   do_bind();
 }
 
+void
+FGViewMgr::postinit()
+{
+    // force update now so many properties of the current view are valid,
+    // eg view position and orientation (as exposed via globals)
+    update(0.0);
+}
+
 void
 FGViewMgr::shutdown()
 {
@@ -732,6 +740,11 @@ FGViewMgr::setView (int newview)
   current = newview;
   // copy in view data
   copyToCurrent();
+
+    // force an update now, to avoid returning bogus data.
+    // real fix would to be make all the accessors use the dirty mechanism
+    // on FGViewer, so update() is a no-op.
+    update(0.0);
 }
 
 

src/Viewer/viewmgr.hxx

@@ -49,6 +49,7 @@ public:
     ~FGViewMgr( void );
 
     virtual void init ();
+    virtual void postinit();
     virtual void bind ();
     virtual void unbind ();
     virtual void update (double dt);
@@ -73,7 +74,7 @@ public:
 
     void add_view( FGViewer * v );
     
-    static const char* subsystemName() { return "view-mgr"; }
+    static const char* subsystemName() { return "view-manager"; }
 private:
     void do_bind();