Update datasets_properties_tables
Created by: wilsonmr
I wanted to be able to use the action to summarise the dataset specification in a validphys report (seperate from a fit)
I thought now was a good time to rename the fit action and make it use fit context rather than opening file
the action is gross at the moment. I kind of wanted to simultaneously make the extraction of info from each DatasetInputSpec
automatic but then keep the output the same as before the PR
Perhaps I should just extract the fields we want with list comp