update for python-ligo-lw "compress =" mechanism

- the "gz =" keyword argument to the XML file I/O functions in python-ligo-lw is being replaced with a "compress =" keyword.  the current release of python-ligo-lw supports both to allow for a transition, but in the next release the "gz =" keyword argument will be removed.  this patch ports the affected codes to the new mechanism.
- note that in nearly all cases (here, in exactly all cases) the default behaviour associated with the new keyword arguments is sufficient so the update is to simply remove the parameters from the function calls.
38 jobs for ligo_lw_compress_keyword in 157 minutes and 24 seconds (queued for 3 seconds)
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