Change a system's Virtualmin license key

This program updates all files that we know contain a Virtualmin licence key with a new serial and key. The two required parameters are --serial and --key, which of course are followed by a valid Virtualmin Pro serial number and key code respectively. If these are not actually valid the program will refuse to apply them unless the --no-check flag is given.

usage: change-licence.pl --serial number
                         --key id
                         [--no-check]