Subset types

We would like to classify the Subsets with a set of tags applied to each subset. The set of allowed values is

• CORE Core collection
• REFERENCE_SET Reference set
• SUSCEPTIBILITY Stress susceptibility
• TOLERANCE Stress tolerance
• GENOMIC Genomic data
• TRAIT Trait selection
• LIST Germplasm list

Add a String tags to Subset.

@Column(length = 20, nullable = true)
private SubsetType subsetType;

@Column(length = 200, nullable = true)
private String primaryTrait;

We should introduce an enum SubsetType to control the incoming values. Only one option is possible.