automatically set a fixed IP from a lease

[cpg]

It would be nice to see a system with an IP in the DHCP Leases tab and easily be able to make it a fixed IP.

The user should be shown some interface to enter the last byte of the new IP. Validation should be done for it to always within the range of fixed IP addresses and also not be the IP of the gateway or the IP of the HDA, as well as any other fixed IP addresses.

Bonus points to auto-suggest the "next available" IP.

[im-Amitto]

@cpg I would like to work on this issue.