Add basic average cadence calculation to treatments

templates/source.html

@@ -251,6 +251,7 @@
 			<div class="card mb-4">
 				<div class="card-body">
 					<div class="table-responsive">
+						<p>Estimated Treatment Cadence: {{.TreatmentCadence|timeInterval}}</p>
 						<table class="table table-striped table-hover">
 							<thead>
 								<tr>
@@ -265,7 +266,7 @@
 								<tr>
 									<td>{{.Date|timeSince}}</td>
 									<td>{{.Product}}</td>
-									<td class="time-delta-neutral">On time</td>
+									<td class="time-delta-neutral">{{.CadenceDelta|timeDelta}}</td>
 									<td>{{.Notes}}</td>
 								</tr>
 								{{ end }}