The Great Rewrite (fixes #36, #61, #94, #101)

Rewrite of the file model and pulling mechanism. Needs lots of cleanup
and bugfixes, now...

scanner/file.go

@@ -6,14 +6,14 @@ type File struct {
 	Name       string
 	Flags      uint32
 	Modified   int64
-	Version    uint32
+	Version    uint64
 	Size       int64
 	Blocks     []Block
 	Suppressed bool
 }
 
 func (f File) String() string {
-	return fmt.Sprintf("File{Name:%q, Flags:0x%x, Modified:%d, Version:%d, Size:%d, NumBlocks:%d}",
+	return fmt.Sprintf("File{Name:%q, Flags:0%o, Modified:%d, Version:%d, Size:%d, NumBlocks:%d}",
 		f.Name, f.Flags, f.Modified, f.Version, f.Size, len(f.Blocks))
 }