Some history of H&P data sets used in Sprons/Soltherm

Notes in Soltherm about use of H&P data:
   HP1990 implemented 1996
   HP1998 implemented 1998
   HP2011 implemented Oct 18 2016.

H&P 1990 - Two line records:
   "th.pd"        20 Apr 1996, 145 items
   "th.pd"         8 Dec 1997, 189 items

H&P 1998 - Two line records:
   "th.pd"        10 Nov 1998, 190 items
   "th+.pd"       18 Sep 1999, 190 items
   "tc-ds55.txt"  22 Nov 2003, 190 items

H&P 2011 - Four line records:
  "tc-ds62.txt"   6 Feb 2012, 256 items
  "tc-ds622.txt" 24 Jan,2015, 288 items
      NOTE: text at bottom of file specs it as "tc-ds63.txt"
  "tc-ds633.txt" 23 Jun 2017, 289 items - Stated to be IN ERROR BY H&P on their web site

          - Five line records, adding a blank line between each, and actual mineral names
  "tc-ds636.txt"  3 May 2023, 291 items -

H&P source files:
Soltherm 1990 uncertain
Soltherm 1998 uncertain
Soltherm 2011 tc-ds62.txt
Soltherm 2023 tc-ds636.txt