Create better tools for tile cache validation/verification

Idea created by mpeters on Mar 31, 2010
    Implemented
    Score1210

    When trying to create a tile cache often times tiles are blank or the caching fails.  Having some sort of gui tool to visualize what tiles have been created at what extent could really help pin point issues and give a better caching experience.  Also, caching to a polygon layer is very inefficient if the tiles in the view overlap another polygon.  IE: caching to county boundaries.  Tiles get created and deleted multiple times during the caching process increasing the overall time to create the cache.