2018-02-16:  FG;  Finally removed mpm_type as it involves dealing with thread-safe PHP... will leave this for another day.

2018-02-15:  FG;  Clean up install, leaving only parts depending on parameters with some default value. Added extra-packages, ssl_ciphers/ssl_protocol, MPM apache2 setting. Fixed auto-update Moodle script.

2018-02-15:  FG;  Added extra-packages to install additional packages, mpm_type/mpm_config to configure Apache2 MPM, ssl_protocol/ssl_ciphers to configure SSL.