Unit size modifier field found by Kurik Amudnil and confirmed via disasm.

http://www.bay12forums.com/smf/index.php?topic=91166.msg4301627#msg4301627
Body part info found by Kurik Amudnil.

http://www.bay12forums.com/smf/index.php?topic=91166.msg4306060#msg4306060
Body size fields discovered by Urist Da Vinci.

http://www.bay12forums.com/smf/index.php?topic=91166.msg4286965#msg4286965
Random fields changed/accessed in blood and body related stuff.

The birth_year_bias name is just a guess, but birth_time_bias is
used in age-related updates to body size & blood etc.
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