Std ViewFitSelection

Description
Zooms until all of the tree view selected objects are shown in the 3D view.

Usage
Invoke the command several ways:
 * Click on [[Image:Std_ViewFitSelection.png|16px]] button in the View toolbar
 * Use the entry from the View menu
 * Press the  keyboard shortcut
 * Right-clicking in the 3D view (and having nothing pre-selected) will bring up the context menu with