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  Name:     getattr() - get attribute from specified screen location
  Usage:    <integer> = getattr(<row>,<col>)
  Params:   integer <row> - the row to read from
            integer <col> - the column to read from
  Returns:  an integer equal to the attribute found at row
            <row>, column <col>.

 ---------------------------------- Example ---------------------------------

                 set color to W/B
                 clear screen
                 ? getattr(0,0)
                 * prints 23

                 print(10,0,"Prints in color at 10,0",getattr(10,0))

  Note:     Getattr() will return the attribute at location <row>,<col>
            based on the current page defined by setpage(), or
            the current virtual screen defined by setscreen()