Added a "dont_nillify" parameter to record save() so that, for testing purposes, we can create records with followup field values that won't get nilled by the piece of code that nils followup attribute values when the parent value is set.  See hco_setup.rb, fill_cases_for_stats, for usage, as well as the counselor_stats_0_0_1.yml file which defines values for closed_early_reason, a followup field, the reason ultimately for why I made this change.