[pacman-dev] Some entries to NEWS

Hi! 1. We have implemented some new features after last NEWS update (for example: foo<1.0-1 dependency support), these commits should be reviewed. 2. I mention an undocumented (<- in NEWS) new feature, too: versioned conflicts (Xavier's conflict clean-up patch introduced this automagically, so this fact wasn't mentioned in commit message, only on ML) Bye