0.6.0

• Added type to appropriate classes
• Removed redundant declaration of slots in class definitions
• Changed has parameter slot to has workflow parameter
• Added data request form slot to the data access policy class
• Added ancestry, data use permission, data use modifier classes
• Added has data user permission and has data use modifier slots to data use permission class
• Added has ancestry that refers to the ancestral group an individual is part of
• Reorganized classes that are ontology classes
• Added metadata mixin to submission class
• Changed has anatomical entity to a multivalued field
• Removed has data access policy from submission class
• Added has protocol and has publication to submission class
• Added type to experiment process
• Added has attribute to experiment process
• Added concept identifier and concept name to ontology class mixin
• Added enum for age range
• Normalized representation of enum values
• Added affiliation to submission class to track the data hub/institution that is making the submission
• Fixed id and alias for publication class
• Added has file to individual class and study class
• Added GWAS to study type enum
• Added drs uri to file class
• Changed has output of experiment process class to be multivalued
• Changed has sample of experiment class to be multivalued
• Added has file to protocol class
• Added type to biospecimen class
• Removed has experiment and has analysis from study class
• Added has attribute to experiment, file, data access policy, `data access committee clases
• Added other category for 'file type enum' and 'age range enum'
• Changed has individual to optional for sample class
• Changed type to optional for dataset class
• Fixed range of size to integer