DB connection using mysql driver.
Database schema
Insert query for default values into zona table.
Ops forget to add return error parameter.
Zona list shall be retrieved from database.
Just adapting esquina model to work with new zona struct.
New zona dao.
Remaining esquina dao methods.
Getting zonas from db.
Embedding sql.Tx
Remaing zona methods.
Lider DAO.
Voluntario DAO