Use the space webhome title to display the space name

Currently in the Dashboard the space name is displayed when listing the spaces.

I propose that we display a nicer title for space names. This title would be the title field from the WebHome document in the space. It would default to the space name if there is no title.
We could improve the space creation function to add a "Space pretty name" when the user creates his space.

Here is code to change in Main.Spaces

          #set($spaceDoc = $xwiki.getDocument("${space}.WebHome"))       
          <div class="spSpaceName">[${spaceDoc.displayTitle}>${space}.WebHome]</div>