SQL: tolerate reports with no records (hotmail)
added warning message for zero record reports
simplify flow of control for SMTP sending

dmarc_send_reports
  consolidated the SMTP flow-of-control to here
  added SSL error message to report when SSL connection fails

moved Report::Send::compress_report to Report::compress
moved Report::Send::human_summary to Report::Send::SMTP::human_summary
update Changes
properly dereference the aggregate object