0994d9b1d7368c disabled gzip compression in write_filename()

this fixes it
glue:  add unit test to validate correctness of gzip'ed output
glue:  update ligolw_test04

the attributes written by Stream elements are now in a different order.
also, somehow this test had been removed from the Makefile so we re-enable
it.  also, the external script isn't needed, we can just in-line the test
in the Makefile
glue:  in-line unit test ligolw_test02