Fix reading 'old-style' LIGO_LW files (with ILWD characters)
This PR fixes reading old-style LIGO_LW XML files that contain ILWD characters.
python-ligo-lw >=1.8.0 removed the ilwd char support, so we need to in-house some of that stuff.
This PR fixes reading old-style LIGO_LW XML files that contain ILWD characters.
python-ligo-lw >=1.8.0 removed the ilwd char support, so we need to in-house some of that stuff.