Update the MiAIRR template to the latest specification

[marcosmro]

Latest spec: https://github.com/airr-community/airr-standards/blob/master/specs/airr-schema.yaml

The required updates include:

• Update the definitions of some fields.
• Following the OntoVoc report, ontologies were introduced for the organism, disease_diagnosis, cell_subset and tissue fields. Update those ontologies in the MiAIRR template.
• Include keyword_* field(s) to increase findability of AIRR- seq data based on high-level properties. The submission specification requires "AIRR" as an element in the 'KEYWORDS' field of the record header. Details can be found at https://docs.airr-community.org/en/latest/miairr/specification_miairr_ncbi.html#record-header

[marcosmro]

Additional updates (from the AIRR MiniStd WG Call on 9/13/2019):

• Replace 'age' with 'age_min' 'age_max' and 'age_unit' (see https://github.com/airr-community/airr-standards/issues/192).
• Add country information regarding place of birth (subject) and place of sampling (sample).