Documented #206 existing and new -memclear options with "In Development" in History.txt

     -memclear 0 Initialize memory to zero
     -memclear 1 Initialize memory to random values
     -memclear 2 Initialize memory to 4 byte pattern: FF FF 00 00
     -memclear 3 Initialize memory to even pages FF, odd pages 00
     -memclear 4 Initialize memory to first half page 00, last half page FF
     -memclear 5 Initialize memory to first half page FF, last half page 00
     -memclear 6   Initialize memory to byte offset of page
                   (current memory address low byte)
     -memclear 7   Initialize memory to page address
                   (current memory address high byte)