BUGFIX: fix calibration marginalization reweighting

@michael.williams this resolves the issue with calibration marginalization reported in bilby#671 (closed).

The issue there was caused by the calibration_model not being updated for the Input.interferometers.

I modified the way the workflow works so that the lookup table will be built during the data generation step. Using this, the safest thing to do is to specify the paths for the files you want, otherwise, they'll just be dumped to the current directory. The paths for the files also need to be explicitly passed to use the file transfer.