Resolve "Delete datafile"

Closes #23 (closed)

Add datafile delete function in Client.py and command line.

client.delete_file(datafile_id)

pyiricdata/Client.py

@@ -612,9 +612,3 @@ class Client:
         r = self.session.delete(del_url)
         print(r.status_code, r.json())
         return r.json()
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