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Fix '_io.BufferedReader' object has no attribute 'next'

Leo P. Singer requested to merge leo-singer/igwn-ligolw:fix-bufferedreader-no-next into master

Under Python 3, many programs such as ligolw_sqlite would fail with the following error message:

Traceback (most recent call last):
  File "/usr/bin/ligolw_sqlite", line 158, in <module>
    ligolw_sqlite.insert_from_url(url, contenthandler = ContentHandler, preserve_ids = options.preserve_ids, verbose = options.verbose)
  File "/usr/lib/python3.7/site-packages/ligo/lw/utils/ligolw_sqlite.py", line 147, in insert_from_url
    xmldoc = ligolw_utils.load_url(url, verbose = verbose, contenthandler = contenthandler)
  File "/usr/lib/python3.7/site-packages/ligo/lw/utils/__init__.py", line 413, in load_url
    xmldoc = load_fileobj(fileobj, **kwargs)
  File "/usr/lib/python3.7/site-packages/ligo/lw/utils/__init__.py", line 340, in load_fileobj
    fileobj = RewindableInputFile(fileobj)
  File "/usr/lib/python3.7/site-packages/ligo/lw/utils/__init__.py", line 144, in __init__
    self._next = self.fileobj.next
AttributeError: '_io.BufferedReader' object has no attribute 'next'

CC @kipp.cannon, @adam-mercer.

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