Particle and Track work plans for 2011
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Particles:
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   *  code review
      exceptions, warnings, arguments of methods (const or non-const objects, pointer, reference or object)

Track:
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   *  New scheme for GetVelocity
       Velocity is defined as a member of G4Track and is given by processes via particle change,
       to solve the problem that G4Track::GetVelocity method is invoked many times per step.
   *  Review flags in tracking (ex. ged rid of ConditionallyForced) 
   *  code review
      exceptions, warnings, arguments of methods (const or non-const objects, pointer, reference or object)
   *  Design a scheme for more precision for tracking in time
      (cooperation with transportation)