open game from commandline

[Liso77]

Sorry, I am not sure if ubuntu is using your code, but in ubuntu 14.04 and 14.10 I could not use qgo to open sgf from web (at least not in simply way) .

I found this -> "Opening files from command line not supported at the moment." in your code and hope that this moment won't be too long :)

Thanx for prolonging life of this app! :)

[pzorin]

Primitive support added in 8d07d62 (should probably reuse existing instance)

[Liso77]

Thanx much! :)