Minor improvement: add more guideline/manual information in command line

[tkt028]

Hi, The current sumo command is not smart in the below sense:

• I want to see the sumo version. By trying different common format "sumo --version", "sumo -version", "sumo version" don't give any output
• I want to see the full list of options that sumo support. I try "sumo", "sumo help", etc but have no clue.

Do you plan to support this feature? I think it's useful to users. Thank you very much! Cheers, Khon