refactor genbank field handling
clear genbank record field
extend to ProteinForm
benchling widget -> Protein/readonly
make speed-critical lookups more efficient
minor bugfix: correct error target field in upload form
author-only delete permission; step 1
author-only delete permission step 2: delete_selected action
cosmetics
non-author deletion block step 3: protect related objects from normal Delete
prevent non-author or creator from making themselves author
delete protection last step: prevent non-authors from making themselfes authors of Sample or Component