Structured XML Files for Worksheets
Structured Test Classes
added Reflector Class
changed Thermostat class into class with static methods. No more
Thermostat objects need to be instantiated.
Added some new funtions (increaseValues) to Particle
added new constructor to Vector
changed cell force in order to accepy vector arguments for cell index.
implementation of static Thermostat methods and implementation of
separated Reflector

some minor changes with logging