FEATURE: basic Git and Mercurial support.
implemented DVCS base class which hould be used in all DVCS plugins, it prevents plugins from duplicating code
fixed bug in git: now all system environment variables are set
fixed bug in mercurial: job<<" "<<" " or job<<"";job<<""; should be used instead of job<<"one two"

Thomas, sorry for removing your code. I was commiting to http://repo.or.cz/w/kdevelopdvcssupport.git because mercurial plugin had a bug (you did the same bug with job<< usage). If you want to help with DVCS: Bazaar is not implemented yet (but it required much less job, than you did to implement mercurial).