hive.operation uses bytea text representation instead of json

Closes #139 (closed)

• in and out are changed to accept/produce bytea text representation (\x123456) instead of json ({"type":"...", "value":"..."})
• body column in operations table is renamed to binary_body
• new column body is added to hive.operations_view
• new functions operation_to_jsontext and operation_from_jsontext are introduced
• test.sh is changed to no longer ignore undefined_function exceptions
• timeout_0_test is removed, because it was failing after the change in previous point