+ fixed v6, new options color/client-macs/rc

+ fixed v6 support
+ added option: color output
+ added option: client-macs (request ethernet address, if not set it will be random; useful for testing static leases)
+ added option: v6-rapid-commit (enable/disable rapid-commit 2way dhcp)
+ changes logging (maybe change to a real log facility in the future)
+ minor fixes