Update GWF writing for frameCPP 3.0.0
This PR addresses an incompatibility between gwpy.io
and python-ldas-tools-framecpp 3.0.0; the compression options changed compared to frameCPP 2.9.
This PR addresses an incompatibility between gwpy.io
and python-ldas-tools-framecpp 3.0.0; the compression options changed compared to frameCPP 2.9.