Bug fix.
Add a function for gaussian distribution (0, sigma^2)
Add a new parameter nu.
Add the Anderson Thermostat algorithm for solving the equation of motion.
Bug fix.
Move anderson thermostat codes to anderson.c as part of the motion module.
Use xcmd_main as the true main function of the MD program.
Project update.
Merge pull request #3 from Bismarrck/dev

Dev