Swap main database to bolt; refactor sp list sorting

sp/commands/commands.go

@@ -81,6 +81,8 @@ receive:
 		keyIDMap[key] = md.ID
 	}
 
+	sort.Strings(keys)
+
 	prompt = &survey.Select{
 		Message:  "Primary user key (and tag):",
 		Options:  keys,

sp/commands/list.go

@@ -65,6 +65,10 @@ includes almost all the information but the most sensitive.`,
 			var source string
 			check(survey.AskOne(prompt, &source, nil))
 
+			sort.Slice(mds[source], func(i, j int) bool {
+				return mds[source][i].Primary < mds[source][j].Primary
+			})
+
 			for _, md := range mds[source] {
 				fmt.Println(md)
 			}