Implemented passwordless ssh-rsa authentication support.

interface/web/client/client_edit.php

interface/web/sites/form/shell_user.tform.php

interface/web/sites/templates/shell_user_edit.htm

interface/web/sites/templates/web_domain_ssl.htm

interface/web/tools/form/user_settings.tform.php

interface/web/tools/lib/lang/de_usersettings.lng

interface/web/tools/lib/lang/en_usersettings.lng

interface/web/tools/lib/lang/hu_usersettings.lng

interface/web/tools/templates/user_settings.htm

server/plugins-available/shelluser_base_plugin.inc.php

server/plugins-available/shelluser_jailkit_plugin.inc.php