Display hours and minutes in friendly form.
The input vars are variants, and will be coerced to Long before calculating. Also calls AuditTimes() to correct values before calculating.
Variant Hours to display
Variant Minutes to display
DisplayHrMin(Null,Null) => - DisplayHrMin(0,0) => - DisplayHrMin(Null,35) => 35 min DisplayHrMin(Null,95) => 1 hr, 35 min DisplayHrMin(2,Null) => 2 hr DisplayHrMin(3,23) => 3 hr, 35 min