Allow initial call date to be after the appointment date

[colinxfleming]

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• What are we trying to do?
  Some funds cover patients that reach out after their abortion care. For these funds we'd want to allow initial call date to be after the abortion date.

• What feature or behavior is this required for?
  Accurate information tracking

• How could we solve this issue? (Not knowing is okay!)
  I think we have one of two options here:
  ** Loosen the validation so that we no longer check for abortion date > initial call date OR
  ** Write a config that allows the above on a fund-to-fund basis.
  I don't think I have an opinion on which is better, but the former is definitely easier. Either way, this involves wrenching around in the Patient object's validations and then adjusting any tests necessary.

• Anything else?
  (By request of a fund)

[colinxfleming]

I'm less worried about data integrity issues here than I was when we put in the constraint originally. Let's do the first one (taking the constraint out entirely) and not worry about the config. Should be somewhere in the model.