Interface changes

• The FileSystemItem class now exposes HostFile and HostedFullName properties.

Behavior changes that may affect your projects

• If two instances of a MemoryFile point to the same file, renaming one no longer makes the second one point to the new filename. AbstractFile and AbstractFolder instances should always be "tied" to their filename.

Other minor changes and bug fixes

• The collection returned by FtpConnection.ListingParsers is no longer read-only.
• Fixed exception that occurred when renaming a file that does not exist.