rapidftr/tracker#67 @ctumwebaze @mwangiann adds ability to mark confirmed enquiries as reunited

This fix only happens when the associated child has been marked as reunited.
rapidftr/tracker#67 @ctumwebaze @mwangiann adds fix to ensure no new potential matches are created for reunited enquiries.
rapidftr/tracker#67 adds ability to unmark enquiries as reunited when the child is unmarked as reunited.
Merge pull request #755 from ctumwebaze/master

Tag corresponding enquiry reunited when marking the child record as reunited.