Include more information in user_agent string.
Include more information in user_agent string.

Example: /Vcash:0.4.6(Peer; Mac OS X)/

sum01/vcash,sum01/vcash,openvcash/vcash,xCoreDev/vanillacoin,openvcash/vcash,xCoreDev/vcash,xCoreDev/vanillacoin,xCoreDev/vcash