fix: readded metadata to phen output. This is now done after the translation based on any column that is not defined as a code column if the file configuraiton. The previous implementation required the user to include which metadata columns to KEEP in the configuration file which resulted in a long config. Of course we may want to exlcude metadata columns we don't want in the final phenotype but if we need that we'll have to implement exclusion. In additon we now retain the source code before it's preprocessed so that we know the starting point whichw as previously lost. Closes 28