Write a default to the system
- name
- The key of the given domain to write to
- domain
- The name of the domain to write to
- value
- The value to write to the given key
- vtype
- The type of value to be written, vaid types are string, data, int[eger],
float, bool[ean], date, array, array-add, dict, dict-add
- user
- The user to write the defaults to