/**
@page tbd To be done
@section errors Handling the errors

When some function returns an error code, it's always possible to get an
english message describing the problem.

The function ssh_get_error() returns a pointer to the static error buffer.

ssh_error_code() returns the error code number : SSH_NO_ERROR,
SSH_REQUEST_DENIED, SSH_INVALID_REQUEST, SSH_CONNECTION_LOST, SSH_FATAL,
or SSH_INVALID_DATA. SSH_REQUEST_DENIED means the ssh server refused your
request, but the situation is recoverable. The others mean something happened
to the connection (some encryption problems, server problems, ...).
SSH_INVALID_REQUEST means the library got some garbage from server, but
might be recoverable. SSH_FATAL means the connection has an important
problem and isn't probably recoverable.

Most of time, the error returned are SSH_FATAL, but some functions
(generaly the ssh_request_xxx ones) may fail because of server denying request.
In these cases, SSH_REQUEST_DENIED is returned.

ssh_get_error() and ssh_get_error_code() take a ssh_session as a parameter.
That's for thread safety, error messages that can be attached to a session
aren't static anymore. Any error that happens during ssh_options_xxx()
or ssh_connect() (i.e., outside of any session) can be retrieved by
giving NULL as argument.


@section threads Working with threads

*** To be written ***

@section forwarding_connections Forwarding connections

*** To be written ***

@section sshd Writing a libssh-based server

*** To be written ***

@section cpp The libssh C++ wrapper

*** To be written ***

*/