Updated PHP Shell/Jailkit code

install/tpl/jk_init_el.ini.master

server/conf/bashrc_user_deb.master

server/conf/bashrc_user_generic.master

server/conf/bashrc_user_redhat.master

server/lib/classes/cron.d/600-jailkit_maintenance.inc.php

server/lib/classes/system.inc.php

server/plugins-available/cron_jailkit_plugin.inc.php

server/plugins-available/shelluser_base_plugin.inc.php

server/plugins-available/shelluser_jailkit_plugin.inc.php