InstantSSH: Added: instant_ssh_users database table
InstantSSH: Added: Password authentication capability
InstantSSH: Added: Support for multiple SSH user per customer
InstantSSH: Changed: The plugin no longer use i-MSCP unix users
InstantSSH: Removed: instant_ssh_keys database table
InstantSSH: Moved: Client interface into the domain section
InstantSSH: Fixed: Customer name must be checked for empty value before sending data ( InstantSSH/Admin - Autocomplete feature )