Add patient appointments field (next appt, last appt) as a mail merge field for individual patients letters (not just group mail merge letters as is now the case)

WORKFLOW: huge impact in cases where indiv letters need to be sent staff has to hand write the dates or create a group mail merge and delete the names of patients that are not needed on this list this can be cumbersome when creating letters for multiple dates... The field should just be available...

All field available for group mail merge documents/letters should also be available for individual patient letters (printed individually from mail merge document)