When making a New Person, people are often entered as Prospect or Applicant. Rank is required in order to save, and currently we are using 'unknown' to meet requirements.

Accurate logic would not require a rank for 'prospect' or 'applicant'. A rank is only needed for people who have joined. This would also require a blank or null choice for rank.

In #166 I noticed that the filter dropdown isn't dark at all, we should fix that :).