Mesh Edit Tools test

   * prim size increased to 64m
   * allow manual return of encroaching objects (when that's merged in)(ER-285)
   * edit tools/camera ease of use when working with larger prims
   * edit tools/camera ease of use when working with meshes on the ground or attached to avatar

• Report any difficulties found while testing.
• Create a box
• Scale the box up to 20m by holding down ctrl+shift and dragging the corner scale widget.
• Scale the box up to 64m by holding down ctrl+shift and dragging the corner scale widget.
• Deselect the box.
• Alt-zoom on the box.
• Orbit your camera around the box.
• Edit the box.
• Scale the box down 1m by holding down ctrl+shift and dragging the corner scale widget.