Update `render' functionality using `trunk/Identity' directory
    structure, commited at revision 2452, as reference. What some time ago
    seemed to fail, works now :). 
    
        - Now, inside the working copy of CentOS Artwork Repository, there
          is one directory structure for input files
          (trunk/Identity/Models) and one directory structure for output
          (trunk/Identity/Images) files for both direct and theme-specific
          rendition.
    
        - To know when we are doing direct or theme-specific rendition,
          the path information of the input file is taken as reference.