broken IOTable backend

[mfastudillo]

I've created a fresh virtual environment that installed bw2data version 4.0 and the importer I created for the IO Tables broke. I suspect it broke the IOTable backend in general. Running the write_database() method inspired in the Exiobase3MonetaryImporter returns a type error:

TypeError: IOTableBackend.write() got an unexpected keyword argument 'signal'

I tried with the previous version 4.0.dev60 and it works

[mfastudillo]

I imagine it can be solved slightly modifying the write method of the IOTable backend which currently is something like:

def write(self, data, process=False, searchable=True, check_typos=True):
    super().write(data, process=False, searchable=searchable, check_typos=check_typos)

maybe something like would do, but I am unfamiliar with blinker

def write(self, data, process=False, searchable=True, check_typos=True,signal=None):
    super().write(data, process=False, searchable=searchable, check_typos=check_typos,signal=signal)

@cmutel ?