FileZilla Server version 0.4 released

This versions fixes all known bugs

new features:
- APPE and QUIT command added
fixed bugs:
- sometimes permissions could not be retrieved due to a bug in GetRealDirectory(), permission was always denied.
- when using APPE or "REST x" (x!=0), it was possible to upload new files in folders with append permission but no write permission.
- fixed some minor bugs