data/map: Wrap decimal degrees to 0 < x < 360

When navigating east/west, the longitude increases indefinely.  So if
you wrap around the globe three times to the west, you end up at 3 * 360
degrees west.  The fix in 863f70a only
handled the wrap around the date line, not around the world several
times.

[ci skip]

Fixes #327

data/map.htm

@@ -124,12 +124,14 @@
     function mbr() {
      if(mbrLayer.getLayers().length > 0){
       var b = mbrLayer.getLayers()[0]._bounds;
-       if(b._southWest.lng < -180) {
-         b._southWest.lng += 360;
-       }
-       if(b._northEast.lng < -180) {
-         b._northEast.lng += 360;
-       }
+      b._southWest.lng = b._southWest.lng % 360;
+      if(b._southWest.lng < -180) {
+        b._southWest.lng += 360;
+      }
+      b._northEast.lng = b._northEast.lng % 360;
+      if(b._northEast.lng < -180) {
+        b._northEast.lng += 360;
+      }
       return [b._southWest.lng, b._northEast.lng, b._southWest.lat, b._northEast.lat];
      }
      return null;

src/gui/WidgetDownloadDEM.cpp

@@ -210,7 +210,6 @@ void WidgetDownloadDEM::saveDEM()
         qDebug()<<"no mbr";
         return;
     }
-    qDebug()<<mbr;
     QVariantList mbrl = mbr.toList();
     for(int i=0; i < mbrl.size(); i++) {
         qDebug() << mbrl[i];