lib/memfs: call the Init method in the embedded file

By calling the Init method, the regular expression for include and
excludes is initialized, which allow using any method of MemFS instance
later, for example the Watch method.

While at it, fix the fields alignment in template code format.

lib/memfs/template.go

@@ -89,7 +89,7 @@ func init() {
 	{{$varname}} = &memfs.MemFS{
 		PathNodes: memfs.NewPathNode(),
 		Opts: &memfs.Options{
-			Root: "{{.Opts.Root}}",
+			Root:        "{{.Opts.Root}}",
 			MaxFileSize: {{.Opts.MaxFileSize}},
 			Includes: []string{
 			{{- range $v := .Opts.Includes}}
@@ -102,7 +102,7 @@ func init() {
 			{{- end}}
 			},
 			Embed: memfs.EmbedOptions{
-				CommentHeader:  ` + "`" + `{{.Opts.Embed.CommentHeader}}` + "`" + `,
+				CommentHeader: ` + "`" + `{{.Opts.Embed.CommentHeader}}` + "`" + `,
 				PackageName:    "{{.Opts.Embed.PackageName}}",
 				VarName:        "{{.Opts.Embed.VarName}}",
 				GoFileName:     "{{.Opts.Embed.GoFileName}}",
@@ -120,6 +120,11 @@ func init() {
 {{- end}}
 
 	{{$varname}}.Root = {{$varname}}.PathNodes.Get("/")
+
+	var err = {{$varname}}.Init()
+	if err != nil {
+		panic("{{$varname}}: " + err.Error())
+	}
 }
 {{end}}
 `