Fix #579

1. Added --workdir command-line argument that lets configure the working dir.
2. Made "dnsforward" use this workdir parameter when saving/reading querylog.
3. Reworked "dnsforward" -- moved http handlers out of there to control.go

config.go

@@ -28,7 +28,7 @@ type logSettings struct {
 // field ordering is important -- yaml fields will mirror ordering from here
 type configuration struct {
 	ourConfigFilename string // Config filename (can be overridden via the command line arguments)
-	ourBinaryDir      string // Location of our directory, used to protect against CWD being somewhere else
+	ourWorkingDir     string // Location of our directory, used to protect against CWD being somewhere else
 	firstRun          bool   // if set to true, don't run any services except HTTP web inteface, and serve only first-run html
 
 	BindHost  string             `yaml:"bind_host"`
@@ -92,7 +92,7 @@ var config = configuration{
 func (c *configuration) getConfigFilename() string {
 	configFile := config.ourConfigFilename
 	if !filepath.IsAbs(configFile) {
-		configFile = filepath.Join(config.ourBinaryDir, config.ourConfigFilename)
+		configFile = filepath.Join(config.ourWorkingDir, config.ourConfigFilename)
 	}
 	return configFile
 }