Currently apt pulls all packages from the unstable repo because the
script intendation created the file 'limit-unstable' with tabs in it.
Fixed using printf to create a multiline file (which is the way
wireguard.com/install suggests).
- 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.
Install script not creating ovpns dir, and throwing error:
```
cp: cannot stat '/tmp/OLD_UFW': No such file or directory
mkdir: cannot create directory ‘/root\n/usr/sbin\n/bin\n/dev\n/bin\n/usr/games\n/var/cache/man\n/var/spool/lpd\n/var/mail\n/var/spool/news\n/var/spool/uucp\n/bin\n/var/www\n/var/backups\n/var/list\n/var/run/ircd\n/var/lib/gnats\n/nonexistent\n/nonexistent\n/run/systemd\n/run/systemd\n/run/systemd\n/nonexistent\n/run/sshd\n/\n/home/pivpntest/ovpns’: No such file or directory
chmod: cannot access '/root'$'\n''/usr/sbin'$'\n''/bin'$'\n''/dev'$'\n''/bin'$'\n''/usr/games'$'\n''/var/cache/man'$'\n''/var/spool/lpd'$'\n''/var/mail'$'\n''/var/spool/news'$'\n''/var/spool/uucp'$'\n''/bin'$'\n''/var/www'$'\n''/var/backups'$'\n''/var/list'$'\n''/var/run/ircd'$'\n''/var/lib/gnats'$'\n''/nonexistent'$'\n''/nonexistent'$'\n''/run/systemd'$'\n''/run/systemd'$'\n''/run/systemd'$'\n''/nonexistent'$'\n''/run/sshd'$'\n''/'$'\n''/home/pivpntest/ovpns': No such file or directory
```
Found incosistencies in instalation user var/files namings, to have it consistend and easy to understand and considering everyone is more familiar with INSTALL_USER
Changed $pivpnUser to INSTALL_USER
Changed pivpnUSR to INSTALL_USER
Removed PiVPN Secure Notes from PiVPN ADD introduced with PR #794
- Notes not being pushed to BW Vault
- OVPN files not going to ovpns dir
- Needs investigation
