Since we add the studies that bring findings for the finding tables manually,
this ensures that we spot any mistakes when entering them, or similar
discrepancies on the other side of the raw data.
Validity calculation belongs to the modelling, so we put it into the
validity module.
Extracting our matrix is a processing step so we made its own matrix
module and put it in their.
Should hopefully provide better separation of concerns going forward.
From strength of findings to the more general validity module, which can then
in turn contain the 'add_to_findings' function which unsurprisingly adds
validities to findings. Makes more sense to me.
All findings tables can use the validities functionality to add strength of
evidence (internal/external) to themselves. Generalized the function to
work for any main findings csv (to dataframe) table not just institional
findings.
