Change history of GDPDM from version
April 20, 2004 to version May 10, 2004.
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- Added comments field to tables div_experiment and
  div_obs_unit_sample.

- Changed field source_assay to div_source_assay_id in
  table div_allele_assay which is a foreign key
  pointing back to the same table, but a different
  row (the source assay).

- Changed fields named "date" since date is a controlled
  word in MySQL.  1) date to date_measured in table div_trait.
  2) date to sample_date in table div_obs_unit_sample.
  3) date to assay_date in table div_allele_assay.

- For description of field poly_type in table div_poly_type,
  added RAWDATA as another possible type.

- Updated description of field value in table div_allele to:
  div_allele.value - Value of the allele.  Examples include:
  For a sequence-type polymorphism, the value would be the
  actual sequence. For an SSR-type polymorphism, the value
  would be the actual length in bp of this allele.

- On field descriptions, changed data type of
  div_allele_assay.position to text.