Introduced in 2.7.0

Major code re-factoring

SSHD-1133 Re-factored locations and names of ServerSession and server-side ChannelSession related classes
Moved some helper methods and classes to more natural locations

Minor code helpers

SSHD-525 Added support for SFTP [email protected] extension](http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL?rev=1.28&content-type=text/x-cvsweb-markup) - see section 3.3
SSHD-1083 Relaxed required Nio2Connector/Acceptor required constructor arguments
SSHD-1085 Added CliLogger + more verbosity on SshClientMain
SSHD-1109 Route tests JUL logging via SLF4JBridgeHandler
SSHD-1109 Provide full slf4j logger capabilities to CliLogger + use it in all CLI classes
SSHD-1110 Replace Class#newInstance() calls with Class#getDefaultConstructor().newInstance()
SSHD-1111 Fixed SshClientCliSupport compression option detection
SSHD-1116 Provide SessionContext argument to HostKeyIdentityProvider#loadHostKeys
SSHD-1116 Provide SessionContext argument to PasswordIdentityProvider#loadPasswords
SSHD-1116 Provide SessionContext argument to AuthenticationIdentitiesProvider#loadIdentities
SSHD-1125 Added option to require immediate close of channel in command ExitCallback invocation
SSHD-1127 Consolidated SftpSubsystem support implementations into SftpSubsystemConfigurator
SSHD-1148 Generate a unique thread name for each SftpSubsystem instance

Behavioral changes and enhancements

SSHD-1085 Added more notifications related to channel state change for detecting channel closing or closed earlier.
SSHD-1091 Renamed sshd-contrib top-level package in order to align naming convention.
SSHD-1097 Added more SessionListener callbacks related to the initial version and key exchange
SSHD-1097 Added more capability to send peer identification via ReservedSessionMessagesHandler
SSHD-1097 Implemented endless tarpit example in sshd-contrib
SSHD-1109 Replace log4j with logback as the slf4j logger implementation for tests
SSHD-1114 Added callbacks for client-side password authentication progress
SSHD-1114 Added callbacks for client-side public key authentication progress
SSHD-1114 Added callbacks for client-side host-based authentication progress
SSHD-1114 Added capability for interactive password authentication participation via UserInteraction
SSHD-1114 Added capability for interactive key based authentication participation via UserInteraction
SSHD-1123 Add option to chunk data in ChannelAsyncOutputStream if window size is smaller than packet size
SSHD-1125 Added mechanism to throttle pending write requests in BufferedIoOutputStream
SSHD-1127 Added capability to register a custom receiver for SFTP STDERR channel raw or stream data
SSHD-1132 Added SFTP client-side support for 'filename-charset' extension
SSHD-1132 Added SFTP client-side support for 'filename-translation-control' extension
SSHD-1132 Added SFTP servder-side support for non-UTF8 encoding of returned file names
SSHD-1133 Added capability to specify a custom charset for parsing incoming commands to the ScpShell
SSHD-1133 Added capability to specify a custom charset for returning environment variables related data from the ScpShell
SSHD-1133 Added capability to specify a custom charset for handling the SCP protocol textual commands and responses
SSHD-1136 Use configuration property to decide whether to allow fallback to DH group exchange using SHA-1 if no suitable primes found for SHA-256
SSHD-1137 Added capability to override LinkOption(s) when accessing a file/folder via SFTP
SSHD-1147 SftpInputStreamAsync: get file size before SSH_FXP_OPEN