Explain both frontends in readme

Also, re-enable openssl and disable debug messages so testing
gocryptfs is less painful

README.md

@@ -2,12 +2,20 @@ GoCryptFS
 =========
 A minimal encrypted overlay filesystem written in Go.
 
-Built on top of the
-native Go FUSE library [bazil.org/fuse](https://github.com/bazil/fuse)
-and the [ClueFS](https://github.com/airnandez/cluefs) loopback file system.
-
 Inspired by [EncFS](https://github.com/vgough/encfs).
 
+GoCryptFS at the moment has two FUSE frontends:
+
+* The [go-fuse](https://github.com/hanwen/go-fuse) FUSE library using its
+  LoopbackFileSystem API
+* The FUSE library [bazil.org/fuse](https://github.com/bazil/fuse) plus the
+  [ClueFS](https://github.com/airnandez/cluefs) loopback filesystem
+
+A frontend is selected on compile-time by setting `USE_CLUEFS` to true or false
+(default false).
+Once I decide that one works better for GoCryptFS, the other one
+will go away.
+
 Design
 ------
 * Authenticated encryption of file contents using AES-GCM-128

cryptfs/log.go

@@ -15,5 +15,5 @@ func (l logChannel) Printf(format string, args ...interface{}) {
 }
 
 
-var Debug = logChannel{true}
+var Debug = logChannel{false}
 var Warn = logChannel{true}

main.go

@@ -19,12 +19,13 @@ import (
 )
 
 const (
-	USE_CLUEFS   = false
+	USE_CLUEFS   = false // Use cluefs or pathfs FUSE frontend
-	USE_OPENSSL  = false
+	USE_OPENSSL  = true // 3x speed increase
 	PATHFS_DEBUG = false
 
 	PROGRAM_NAME = "gocryptfs"
 
+	// Exit codes
 	ERREXIT_USAGE  = 1
 	ERREXIT_NEWFS  = 2
 	ERREXIT_MOUNT  = 3

pathfs_frontend/file.go

@@ -90,7 +90,7 @@ func (f *file) doRead(off uint64, length uint64) ([]byte, fuse.Status) {
 
 // Read - FUSE call
 func (f *file) Read(buf []byte, off int64) (resultData fuse.ReadResult, code fuse.Status) {
-	cryptfs.Debug.Printf("\n\nGot read request: len=%d off=%d\n", len(buf), off)
+	cryptfs.Debug.Printf("Read: offset=%d length=%d\n", len(buf), off)
 
 	if f.writeOnly {
 		cryptfs.Warn.Printf("Tried to read from write-only file\n")