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PS_create_page_block

# Arguments: $filename$ : name of input code file
#            $xpages$   : # of pages in the horizontal direction
#            $ypages$   : # of pages in the vertical direction
#             
# Return Values: %page_block : associative array of pages, keyed by (x, y) 
# Description: Given the input code filename and the number of pages in the 
#              x and y directions, create an associative array of blank  
#              pages.