Use new log wrapper and add more functions to it.

helpers.go

@@ -3,7 +3,6 @@ package main
 import (
 	"bufio"
 	"errors"
-	"fmt"
 	"io"
 	"io/ioutil"
 	"net/http"
@@ -135,17 +134,3 @@ func _Func() string {
 	f := runtime.FuncForPC(pc[0])
 	return path.Base(f.Name())
 }
-
-func trace(format string, args ...interface{}) {
-	pc := make([]uintptr, 10) // at least 1 entry needed
-	runtime.Callers(2, pc)
-	f := runtime.FuncForPC(pc[0])
-	var buf strings.Builder
-	buf.WriteString(fmt.Sprintf("%s(): ", path.Base(f.Name())))
-	text := fmt.Sprintf(format, args...)
-	buf.WriteString(text)
-	if len(text) == 0 || text[len(text)-1] != '\n' {
-		buf.WriteRune('\n')
-	}
-	fmt.Fprint(os.Stderr, buf.String())
-}