This fixes hits when using the MySQL full text search backend

If there is a problem installing some of the items with the system, try not
to crash simply because the error is passed into another ::create()
function.

Also, fix duplicate emails where a user as a collaborator would be sent a
confirmation for their own respective email.

Furthermore, revamp the __cdata system to better support multiple selection
fields. Drop the `.._id` fields and use a coalesce of the ID value of the
entry value or the entry value itself. For JSON backed fields, strip some
JSON characters to result in a comma-separated list.

The search engine now uses MySQL FIND_IN_SET to analyze a search selection
in advanced searches. Also, interaction with the MySQL full text search
backend is fully supported.

Set the correct error message and maintain user selection & input

Not just the SelectionField. This will make room for the InlineFormField

Make the error message clear