Function silc_client_command_pending
SYNOPSIS
void silc_client_command_pending(SilcClientConnection conn,
SilcCommand reply_cmd,
uint16 ident,
SilcClientPendingDestructor destructor,
SilcCommandCb callback,
void *context);
DESCRIPTION
Add new pending command to be executed when reply to a command has been
received. The `reply_cmd' is the command that will call the `callback'
with `context' when reply has been received. If `ident is non-zero
the `callback' will be executed when received reply with command
identifier `ident'.