vegbien.sql: methodtaxonclass: Added description field for taxon classes that don't fit well into a plantconcept. Made at least one of plantconcept_id or description required. Added unique constraint.
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vegbien.sql: methodtaxonclass: Added description field for taxon classes that don't fit well into a plantconcept. Made at least one of plantconcept_id or description required. Added unique constraint.