Refresh panel after Block move (otherwise, no-longer-dangling ends of e.g. HierLabels are still displayed)

to change the sheet.  there is no 'change' since the sheet is new, and the associated screen 
should either be loaded from the hierarchy or from a file. 

    KiCad installation.
  * how-to-build-kicad.txt deprecated.
  * how-to-build-for-windows.txt deprecated.