GDPDM pending issues as of April 20, 2004.
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- Definition of field quality in table div_allele.

- Should we add allele_frequency to table div_allele?

- Do we need a table (div_quality_type) to define the
  meaning of the quality value in the div_allele table?

- Do we need field season in the div_obs_unit table?

- How do we need to handle "phase determined"?  This was
  a field in the div_allele_assay table, but phase matters
  over mulitple assays.

- Need to evaluate the definition of field quality in
  table div_allele.  We may want to have a table
  that constrains quality_type?

- Need to make sure assignment of required/not required
  fields are appropriate.