Log Message:
update to nut 0.50.0.  notable changes:
- change from tcp/ip port 3305 to the IANA assigned 3493
- all old-style drivers have been deprecated:
	aeg bestfort bestuferrups engetron ipt-anzen
	mgeups multilink mustekups optiups sms
	toshiba1500 ups-trust425+625 upseyeux
- newvictron renamed to victronups
- newpowercom renamed to powercom, replacing previous powercom
  and ups-trust425+625 as well