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  Description:  Resize Memory Block
 
  Dynamically shrinks or extends a memory block, according to the needs of
  an application program.
 
  Input                                   Output
  ════════════════════════════            ════════════════════════════════
  AH=4AH                                  If function successful
  BX=desired new block size in            Carry flag=clear
     paragraphs                           If function unsuccessful
  ES=segment of block to be               Carry flag=set
     modified                             AX=error code
                                          BX=maximum block size available
                                             (paragraphs)
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