Change history of GDPDM from version
April 15, 2004 to version April 20, 2004.
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- changed all primary keys to type autonumber.
  this was to facilate use of migration tool.

- in table div_passport, changed field collnumb
  to type text.

- in table div_obs_unit, fields planting_date
  and harvest_date were changed to short date format.

- in table div_obs_unit, field summary
  was changed to type text (255).

- in table div_obs_unit, fields rep, block, and
  plot were changed to type text.

- in table div_allele, field quality was changed
  to type memo.

- in table div_allele, field value was changed
  to type memo.

- in table div_treatment_uom, add field local_treatment_name
  with type text.

- removed tables div_exp_entry and div_fieldlevels

- added fields proportion and total_n to the
  div_allele table.

- removed field phase_determined from the
  div_allele_assay table.