Redo log level flags

* -vv or --log-level DEBUG
  * -v or --log-level INFO
  * --log-level NOTICE (default)
  * -q --log-level ERROR

Replace Config.Verbose and Config.Quiet with Config.LogLevel

Fixes #739 Fixes #1108 Fixes #1000

fstest/fstests/fstests.go

@@ -73,8 +73,9 @@ func TestInit(t *testing.T) {
 	for _, item := range ExtraConfig {
 		fs.ConfigFileSet(item.Name, item.Key, item.Value)
 	}
-	fs.Config.Verbose = *verbose
-	fs.Config.Quiet = !*verbose
+	if *verbose {
+		fs.Config.LogLevel = fs.LogLevelDebug
+	}
 	fs.Config.DumpHeaders = *dumpHeaders
 	fs.Config.DumpBodies = *dumpBodies
 	t.Logf("Using remote %q", RemoteName)