TLMagWidget: update header
TLMapWidget: make QGLWidget child of QGraphicsScene
TLMapWidget: use scene() instead of tracking local variable

This was used somewhat inconsistently and now is done more safely.
Also the resize operation is done after construction the whole
scene.
TLMapWidget: formatting cleanup
TLMapWidget: use setViewpoint consistently
TLMapControl: update headers
Merge pull request #1354 from peabody124/map_cleanup

Map cleanup