- exit code 1 means general error hence should not be used for exiting successfully
* added backup script to backup openvpn and pivpn generated certificates
* added update script to update /opt/pivpn scripts, -t | --test | test update from test branch
* Fixed hostname length issue #831
- the script now checks for hostname length right at the beginning and prompts for a new one.
- HOST_NAME to host_name, as best practice variables with capitals, should be used by system variables only.
* fixed ubuntu 18.04 being detected as not supported OS, now fully supported and tested.
* changed how scripts are copied to /opt/pivpn, it hat a lot of long repetitive lines, now it copies all *.sh files making it easier to manage when adding new scripts/features
* Changed how supported OS are presented when maybeOS_Support() is called.
