changed the Chembl_id and Chembl_unit fields to readonly, to avoid changes by users.
Changed Assay Readout device to be the OrganModel instead of the Device Name.
changed the Chembl_id and Chembl_unit fields to readonly, to avoid changes by users.
Changed Assay Readout device to be the OrganModel instead of the Device Name.
Rebase on master
Merge pull request #207 from UPDDI/Issue-#202

Issue #202