Reagents

Split reagents into its own field. @yannis This needs a simple database migration like this one server/models/manuscriptVersion/migrations/1571684886-create_submitted_column.js. What the number at the beginning of the file name? Will it automatically be run with yarn migrate?

Update: I see that I need to run something like knex migrate:make create_reagents_column to create the file, but it give me this error: No knexfile found in this directory. Specify a path with --knexfile