ENH: formhandler table to not allow add and edit happen at same time, fixes #123 by @sindhura.ch

also refactor existing tests to use formhandler_csv.json over formhandler.json
2 jobs for dev in 2 minutes and 4 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #92725
deploy

00:00:45

passed #92724
validate

00:01:19