API breakage. Starting modifying Traj interface to minimize allocations. Xtc interface passes tests
API break: Traj and ConcTraj interface modified to match XTC new version, DCD modified and seems to work
Merge branch 'newTraj'. This merge breaks the API. The XtcObj, DcdObj, Traj and TrajConc structures and interfaces have changes in their methods. This allows to minimize allocations.