[SD-User] SD V21.09 for IOTA

[Paul O'Kane]

V21.09  21 July 2019

IOTA Contest:
   Broken code in V21.08 overwrote island references with ITU
   zones. Fixed.

   Included - updated island reference files for 2019.
     SDIOTA.CTY - Countries and Islands by callsign prefix.
     IOTA.MLT - IOTA Reference multiplier file.
     IOTA.LST - Island call-history file.

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Please test the IOTA option in this version of SD, and let me know
if anything needs to be changed.  SD is free from www.ei5di.com

73,
Paul EI5DI