New cxs v6.22

Changes:

• Added new option [no]unofficial. This option ignores unofficial ClamAV signatures by default. This has been brought in to tackle the increasing number of false-positives in unofficial virus signatures
• WARNING: Due to the new –[no]unofficial the unsupported option –YSKIPUNCLAM has been removed and will have no effect if used
• Modified UI to always try contacting the clamd socket to ensure it is installed, configured and running