3D viewer: shows now the texts of footprints (ref, value and others) when visible.
Fix also other very minor issues.
Realistic mode shows or not the copper thickness (depending on selected option in preferences) to speed up the screen redraw.
Commit patch about  cvpcb, pcbnew and layout editor menu items, with 3 menu labels modified in Eeschema.
3D viewer: fix mirroring issue for texts in flipped footprints.
Pcbnew: fix global deletion bug and minor dialog changes. (fixes lp:1263795)

* Handle different item global deletions correctly.  No more removing of text
  if graphics is selected.
* Layer settings are always obeyed for modules, zones, text, and graphics.
* Text will be removed from copper layers if all layers are selected or
  according to the current layer.
* Added check boxes for "normal" and "locked" footprints to be consistent
  with the naming for the track deletion options.