monfront - make fake groups in frontend

It would have been nice to use rowgrouping for the node name, but
somehow it wasn't easy to get the rowcount. So this should do for now.

cmd/monfront/main.go

@@ -172,7 +172,9 @@ func showChecks(w http.ResponseWriter, r *http.Request) {
 		}
 		checks = append(checks, c)
 	}
-	tmpl, err := template.New("checklist").Parse(TmplCheckList)
+	tmpl := template.New("checklist")
+	tmpl.Funcs(Funcs)
+	tmpl, err = tmpl.Parse(TmplCheckList)
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte("problems with a template"))
@@ -318,10 +320,11 @@ var (
 					<table>
 						<thead><tr><th></th><th>host</th><th>status</th><th>next check</th><th>message</th></tr></thead>
 						<tbody>
+						{{ $current := "" }}
 						{{ range . }}
 						<tr>
 							<td><input type="checkbox" name="checks" value="{{ .CheckID }}" /></td>
-							<td>{{ .NodeName }}</td>
+							<td>{{ if ne $current .NodeName }}{{ $current = .NodeName }}{{ .NodeName }}{{ end }}</td>
 							<td class="state-{{ .State }}">{{ .CommandName }} - {{ .State }}</td>
 							<td>{{ .NextTime.Format "2006.01.02 15:04:05" }}</td>
 							<td><pre>{{ .Msg }}</pre></td>
@@ -334,4 +337,7 @@ var (
   </body>
 </html>`
 	TmplUnhandledGroups = `TODO`
+	Funcs               = template.FuncMap{
+		"sub": func(base, amount int) int { return base - amount },
+	}
 )