Auto-generate export_config.py

[kwabenantim]

Summary

A manually created export_config.py is required in the data folder. We might want to auto-generate it because by default it is not there from the syncropatch machine.

Alternatively, it could be moved to the pcpostprocess directory.

We should add a README entry explaining how to set up this config file.

[chonlei]

Probably my bad. When I first created it, I was handling only one dataset for myself, so thought it'd make sense to leave it with the data, as it is more like a meta data file for exporting. Not sure how you would generate it automatically as it tries to specify file names that are probably different in different experiments/runs (user specifies it). I guess moving it to the export repo would make sense.

[mirams]

Difficult to automate because it depends what the user typed in to the SyncroPatch to name the protocol (unless we analyse the protocol definitions to spot the staircaseramp, but that seems overkill!). So maybe we keep it as it is and just manually add them all for now. @joeyshuttleworth has started doing it manually I think...