Major changes from v.2.0 to v.2.2 consist in code restructuring to make it more clear and more
convenient for future development. Also, the algorithm of MC engine was rewritten, particularly
a matrix of distances between all pairs of particles is introduced which provided substantial
speed-up of the calculations.
The support for non uniform Monte Carlo steps was introduced, so individual step size can be defined for every molecule type (for atom displacement, molecule translation and molecule rotation steps). Also added automatic MC step adjustment, which tries to adjust MC steps on runtime, providing desired acceptance ratio (specified by user). This is only performed during equilibration phase.
There were however no principal changes from the user point of view, both concerning new functionality or syntax of input/output files.
